RET Return From Subroutine, Psw ← Emb,Erb | Samsung KS57C2308

SAM47 INSTRUCTION SETKS57C2308/P2308/C2316/P2316

RET — Return From Subroutine

RET

Operation:	Operand	Operation Summary	Bytes	Cycles

	–	Return from subroutine	1	3

Description: RET pops the PC values successively from the stack, incrementing the stack pointer by six. Program execution continues from the resulting address, generally the instruction immediately following a CALL or CALLS.

Operand			Binary Code						Operation Notation

–	1	1	0	0	0	1	0	1	PC13–8 ← (SP+1) (SP)
									PC7–0 ← (SP+2) (SP+3)
									PSW ← EMB,ERB
									SP ← SP+6

Example: The stack pointer contains the value 0FAH. RAM locations 0FAH, 0FBH, 0FCH, and and 0FDH contain 1H, 0H, 5H, and 2H, respectively. The instruction

RET

leaves the stack pointer with the new value of 00H and program execution continues from

location 0125H.

During a return from subroutine, PC values are popped from stack locations as follows:

SP → (0FAH)		PC11–PC8

SP + 1 (0FBH)	0	0	PC13	PC12

SP + 2(0FCH)		PC3–PC0

SP + 3(0FDH)		PC7–PC4

SP + 4(0FEH)	0	0	EMB	ERB

SP + 5(0FFH)	0	0	0	0
SP + 6(00H)
SP + 6(00H)

5-78

Image 152

Samsung KS57C2308 manual RET Return From Subroutine, Psw ← Emb,Erb

Contents

Product Overview Overview Pins Bit Basic TimerBit Timer/Counter Watch Timer Block Diagram KS57C2308 INT4 INT0INT1 INT2 Test signal input must be connected to V SS Test PIN Circuit Diagrams Pin Circuit Type E P4, P5 Address Spaces OverviewGeneral-Purpose Program Memory Vector Addresses GENERAL-PURPOSE Memory Areas Vector Address AreaEMB ERB PC9 PC8 PC7 PC6 PC5 PC4 PC3 PC2 PC1 PC0 + Programming TIP Defining Vectored Interrupts + Programming TIP Using the REF Look-Up Table Instruction Reference Area Data Memory RAM Memory Banks 0, 1, F80H-FFFHData Memory Addressing Modes Working Registers + Programming TIP Clearing Data Memory Banks 0 Ramclr SMBRMCL1 @HL,A Incs SMB RMCL0 @HL,A Incs Working Registers Working Register Map Working Register Banks Paired Working Registers Special-Purpose Working Registers + Programming TIP Selecting the Working Register Area INT0 PushSRB Incs WX,EA YZ,EA POP Stack Pointer SP SP3 SP2 SP1SP7 SP6 SP5 SP4 + Programming TIP Initializing the Stack Pointer Push Operations Push InstructionsCall Instructions Interrupt Routines POP Operations POP InstructionsRET and Sret Instructions Iret Instructions BSC Register Organization Name Address Bit Program Counter PC MSB LSB FB0H IS1 IS0 EMB ERB FB1H SC2 SC1 SC0 IS1 IS0 Interrupt Status Flag Bit SettingsInterrupt Status Flags IS0, IS1 + Programming TIP Using the EMB Flag to Select Memory Banks EMB Flag EMB ERB Flag ERB HL,EA Valid Carry Flag Manipulation Instructions Operation Type Skip Condition Flags SC2, SC1, SC0Carry Flag C Band HL,#0AAHADC EA,HL Address Spaces Addressing Modes RAM Address Structure + Programming TIP Initializing the EMB and ERB Flags Reset Bitr EMBEMB and ERB Initialization Values EMB-Independent Addressing Enable Memory Bank SettingsEMB = Select Bank Register SB Select Memory Bank SMB Instruction Bank Mapping Direct and Indirect AddressingBIT Addressing Bit Indirect Addressing @HL @WLAdata EQU Bdata EQU 8EH SMB Bdata EQU HL,#BDATA WX,#ADATA Comp @WLCpse @HL Sret Decs Comp RET Bit Indirect Addressing Example HL,#BDATA WX,#ADATA Trans @WLXchd @HL SMB HL,#BDATA WX,#ADATA Trans @WL EA,P4 SMB ADATA,EABDATA,EA Bdata EQU 8EH SMB EA,P4 HL,#ADATA EA,@HL SMB HL,#ADATA EA,@HL Memory MAP MAP for Hardware Registers I/O Map for Memory Bank Addressing Mode Register Bit FB7H Scmod FB8H INT a IE4 IRQ4 IEB IrqbFbah INT B IEW Irqw Fbch INT C IET0 IRQT0 Register Descriptions Register Description Format Bit Identifier Bmod Basic Timer Mode RegisterRead/Write Bit Addressing Basic Timer Restart Bit Clock Source and Frequency Selection Control Bits Clmod Clock Output Mode RegisterFD0H IE1 IRQ1 IE0 IRQ0 IE0, 1, IRQ0, 1 INT0, 1 Interrupt Enable/Request FlagsFbeh IE2 IRQ2 IE2, IRQ2 INT2 Interrupt Enable/Request FlagsFbfh IE4, IRQ4 INT4 Interrupt Enable/Request Flags IEB, Irqb Intb Interrupt Enable/Request FlagsFB8H IE4 IRQ4 IEB Irqb IES, Irqs Ints Interrupt Enable/Request Flags Ints Interrupt Enable FlagFbdh IES Irqs IET0, IRQT0 INTT0 Interrupt Enable/Request Flags INTT0 Interrupt Enable FlagFbch IET0 IRQT0 IEW, Irqw Intw Interrupt Enable/Request Flags Intw Interrupt Enable FlagFbah IEW Irqw FB4H IMOD0 External Interrupt 0 INT0 Mode RegisterExternal Interrupt Mode Control Bits IMOD1 External Interrupt 1 INT1 Mode Register FB5HIMOD1.0 External Interrupt 1 Edge Detection Control Bit IMOD2 External Interrupt 2 INT2 Mode Register FB6HIMOD2.2 IMOD2.1 IMOD2.0 External Interrupt 2 Edge Detection Selection Bit Interrupt Master Enable Bit IPR Interrupt Priority RegisterFB2H IME LCD Clock Output Disable/Enable Bit Lcon LCD Output Control RegisterF8EH Read/Write Bit Addressing LCD Bias Selection Bit Lmod LCD Mode Register F8DH, F8CHLCD Clock Lcdck Frequency Selection Bits Duty and Bias Selection for LCD Display Pcon Power Control Register Read/Write Bit Addressing CPU Operating Mode Control BitsFB3H CPU Clock Frequency Selection Bits PMG1 Port I/O Mode Flags Group 1 Port 3 FE9H, FE8H PM7 PM5 PM4 PM2 PMG2 Port I/O Mode Flags Group 2 Port 2, 4, 5,FEDH, Fech PNE N-Channel Open-Drain Mode Register FD7H, FD6H SC2-SC0 SC1 IS1 IS0 EMB ERB PSW Program Status WordFB1H, FB0H PUR7 PUR6 PUR5 PUR4 PUR3 PUR2 PUR1 PUR0 Pumod Pull-Up Resistor Mode RegisterFDDH, Fdch 1Bit Scmod System Clock Mode Control RegisterFB7H Smod Serial I/O Mode Register FE1H, FE0H TMOD0 Timer/Counter 0 Mode Register F91H, F90H Timer/Counter 0 Input Clock Selection BitsEnable/Disable Timer/Counter 0 Bit Clear Counter and Resume Counting Control Bit TOE Timer Output Enable Flag Register Timer/Counter 0 Output Enable FlagTOE0 Bit3 Wdflag Watchdog Timer Counter Clear Flag Register Watchdog Timer Counter Clear FlagF9AH Wdtcf Wdmod Watchdog Timer Mode Register F99H, F98H Watchdog Timer Enable/Disable ControlWdmod 5AH Wmod Watch Timer Mode Register F89H, F88H Instruction SET Features SAM47 Instruction SET Instruction Reference Area Reducing Instruction Redundancy Bitr EMB Instructions Which Affect the Carry Flag Flexible Bit ManipulationInstructions Which Have Skip Conditions SBC A,@HL ADC and SBC Instruction Skip ConditionsADC A,@HL Register Identifiers Full Register Name Symbols and Conventions Data Type SymbolsInstruction Operand Notation Symbol Definition Opcode Definitions Opcode Definitions Direct RegisterOpcode Definitions Indirect Register @HL @WX @WL HIGH-LEVEL Summary Idle StopCpse EA,RR XCH EA,DAXchi @HL DA,A COM ADC @HLADS SBC @HL Btstz Bitr Binary Code Summary SCF RCF CCF First Byte Condition PC13-8 ← SP + 1 SP Ra,#im Ra ← im RR,#imm RR ← imm EA,RR EA ← EA XOR RR EA,RR EA ← EA and RREA,RR EA ← EA or RR ← a + HL + C Skip if C = Second Byte Bit Addresses FB0H-FBFH FF0H-FFFH LDB Instruction Descriptions ADC Add With Carry ADCOperation Operand Operation Summary Bytes Cycles Operand Binary Code Operation Notation #8H ← 8H ADS Add And Skip On Overflow ADSADS EA,HL JPS YYY EA ← 0C3H + 12H = 0D5H Logical Band Bit Logical BandSMB Band Band C,P1.@L Flag EQU Band @H+FLAG Bitr Bit Reset BitrFF1H-FF9H Bitr P2.0 BP2 Bitr Incs BP2 Bits P2.0 Bits Bit SetBits BP2 Bits BOR Bit Logical or BOR BOR @H+FLAG Btsf Bit Test and Skip on False BtsfLABEL2 LABEL3 BP2 Btsf RET Incs BP2 Btst Bit Test and Skip on True Btst BP2 Btst BP2 Btstz Btstz Bit Test and Skip on True Clear BitBtstz Btstz @H+FLAG Bits @H+FLAG RCF Bxor C,P1.0 Bxor Bit Exclusive orBxor Bxor @H+FLAG Operand Operation Summary Bytes Cycles Call Call ProcedureCall Operation Calls Call Procedure Short Calls OperationCalls Play 0FFH 0FEH EMB, ERB 0FDH 0FCH 0FBH 0FAH CCF Complement Carry Flag CCF COM a COM Complement AccumulatorCOM Cpse EA,HL RET Cpse Compare and Skip if EqualCpse Decs Decrement and Skip on Borrow DecsDecs HL Call PLAY1 DI Disable Interrupts EI Enable Interrupts Idle NOP Idle Idle OperationIdle Incs @HL Incs Increment and Skip on CarryIncs Iret Return From Interrupt IretIS1 IS0 EMB ERB SC2 SC1 SC0 JP Jump JP OperationADR14 Jump to direct address 14 bits JPS Jump Short JPS OperationADR12 Jump direct in page 12 bits JR Jump Relative Very Short JR KK JPS AAA BBB CCC DDDEA,WX ADS WX,EA JPS YYY XXX LD LD Load Description Operand Binary Code Operation Notation Instruction Operation Description and Guidelines Examples Instruction Operation Description and Guidelines LDB Load Bit LDB Flag LDB @H+FLAGFlag EQU 20H.3 RCF LDB @H+FLAG,C LDC Load Code Byte LDCCall Display JPS Main ORG Display LDC 01FFH LDC Display LDORG 01FDH LDD Load Data Memory and Decrement LDD Operation HL,#2FH LDI @HL LDI Load Data Memory and IncrementLDI Operation Stop NOP NOP No OperationNOP Or Logical or Or EA,@HL POP HL POP Pop From StackPOP Push HL Push Push Onto StackPush RCF Reset Carry Flag RCF Operand Operation Summary Bytes Cycles Memc Reference code REF Reference InstructionOperation AAA LD BBB EA,#FFH CCC Tcall SUB1 DDD TJP SUB2BBB EA,#FFH CCC Call SUB1 DDD SUB2 Opcode Symbol Instruction HL,#0FHTcall SUB1 TJP SUB2 ORG PSW ← EMB,ERB RET Return From SubroutineRET RRC a RRC Rotate Accumulator Right Through CarryRRC SBC Subtract With Carry SBCSCF SBC EA,HL RCF SBC EA,HL #8H SBS Subtract SBSRCF SBS EA,HL SCF SBS EA,HL SCF Set Carry Flag SCF SMB Select Memory Bank SMBAddresses Register Areas Bank Format Binary Code Operation Notation SRB ERB Setting SRB Settings Selected Register BankSRB Select Register Bank Sret Return From Subroutine and Skip Sret Stop Stop Operation Stop Vent Load EMB, ERB, and Vector Address VENTn VENTn Example The instruction sequence XCH EA,@HL XCH Exchange a or EA with Nibble or ByteXCH YYY Xchd @HL Xchd Exchange and DecrementXchd Operation Xchi Exchange and Increment Xchi OperationHL,#2FH YYY Xchi @HL XOR EA,HL XOR Logical Exclusive orXOR SAM47 Instruction SET Oscillator Circuits Interrupts Power-Down Page Oscillator Circuits CPU Clock Notation Using a Subsystem Clock Clock Control Registers Clock Circuit Diagram STO Main System Oscillator Circuits Subsystem Oscillator Circuits Power Control Register Pcon Pcon Bit Settings Resulting CPU Operating ModePCON.1 PCON.0 SCMOD.0 = Instruction Cycle Times + Programming TIP Setting the CPU ClockPCON,A System Clock Mode Register Scmod FB7H SCMOD.3 SCMOD.2 SCMOD.0 ScmodSCMOD.3 SCMOD.2 SCMOD.0 Fx Oscillation Fxt Oscillation Oscillator CIRCUITSKS57C2308/P2308/C2316/P2316 KS57C2308/P2308/C2316/P2316OSCILLATOR Circuits Switching the CPU Clock Elapsed Machine Cycles During CPU Clock Switch Clock Output Mode Register Clmod Result of CLMOD.3 SettingCLMOD.1 CLMOD.0 Clock Source Frequency Clock Output Procedure Clock Output Circuit CLMOD,A + Programming TIP CPU Clock Output to the CLO PinPMG2,EA Interrupt Types and Corresponding Port Pins Interrupt Name InterruptsINT0, INT1, INT4 INTB, INTT0, Ints Power-Down Mode Release Vectored InterruptsSoftware-Generated Interrupts Multiple Interrupts Interrupt Execution Flowchart Interrupt Control Circuit Diagram Multiple Interrupts Two-Level Interrupt Handling Multi-Level Interrupt Handling Standard Interrupt Priorities Default Priority Interrupt Priority Register SettingsResult of IPR Bit Setting Interrupt Priority Register IPR IMOD0 IMOD0.3 IMOD0.1 IMOD0.0 IMOD1 IMOD1.0 External INTERRUPT0 and INTERRUPT1 Mode Registers INT0 Noise Filter Edge Clock SelectorINT1 IMOD0 IRQ0 IRQ1 Edge IMOD1 External Interrupt 2 Mode Register IMOD2 IMOD2 Register Bit SettingsEffect of IMOD2 Settings FB6H IMOD2.2 IMOD2.1 IMOD2.0 Circuit Diagram for INT2 and KS0-KS7 Pins Interrupt Flags IME IPR.2 IPR.1 IPR.0 Interrupt Request Flags IRQx Iret INT4 Bitr IRQ4 + Programming TIP Enabling the Intb and INT4 InterruptsIntb Btstz Irqb POWER-DOWN Stop Idle CPU Idle Mode Timing Diagrams Timing When Idle Mode is Released by Reset Stop Mode Timing Diagrams Timing When Stop Mode is Released by Reset Keyclk Call MA2SUB P2,EAIMOD2,A SMB Bitr Irqw IRQ2 Bits IEW IE2 CLKS1 Call Watdis Port PIN Configuration for POWER-DOWN Recommended Connections for Unused Pins P3.1/LCDSYP3.0/LCDCK SEG0-SEG23 POWER-DOWN Timing for Oscillation Stabilization After Reset Hardware Register Values After Reset Program Status Word PSWData Memory RAM Clocks Basic Timer Timer/Counters 0Watchdog Timer LCD Driver/Controller KS57C2308/P2308/C2316/P2316 Port Mode Flags Pull-Up Resistor Mode Register PumodChannel Open-Drain Mode Register PNE 10 I/O Ports P6,EA Pumod ID Port Mode Flags PM FlagsPULL-UP Resistor Mode Register Pumod Channel OPEN-DRAIN Mode Register PNE LMOD.7 and LMOD.6 Setting for Port 8 Output ControlLCD Output Segments Bit Output Pins PIN Addressing for Output Port SEG24 SEG251FAH SEG26 1FBH SEG27 Port 0 Circuit Diagram Port 0 Circuit Diagram Port 1 Circuit Diagram IMOD0 IMOD1 Port 2 Circuit Diagram Port 2 Circuit Diagram Port 3 and 6 Circuit Diagram Port 3 and 6 Circuit Diagram Port 4 and 5 Circuit Diagram Port 4 and 5 Circuit Diagram Port 7 Circuit Diagram Port 7 Circuit Diagram 10-12 KS57C2308/P2308/C2316/P2316 Timers and TIMER/COUNTERS Oscillation Stabilization Interval Control Interval Timer FunctionWatchdog Timer Function Basic Timer Register Overview Type Description Size Addressing Reset Name ModeRAM Wdtcf Basic Timer Mode Register Bmod Basic Timer Mode Register Bmod OrganizationBasic Timer Input Clock Interval Time BMOD.3 Basic Timer Counter Bcnt Basic Timer Operation Sequence + Programming TIP Using the Basic Timer Watchdog Timer Mode Register Wdmod Watchdog Timer Counter WdcntWatchdog Timer Counter Clear Flag Wdtcf Bmod BMOD,A Main Bits Wdtcf + Programming TIP Using the Watchdog TimerReset Bits EMB SMB BIT TIMER/COUNTER 0 TC0 TC0 Function Summary TC0 Component Summary TC0 Circuit Diagram TC0 Register Overview Type Description Size Disable Timer/Counter TC0 ENABLE/DISABLE ProcedureEnable Timer/Counter TC0 Programmable TIMER/COUNTER Function TC0 Operation Sequence TMOD0 Settings for TCL0 Edge Detection TC0 Event Counter FunctionTMOD0.5 TMOD0.4 TCL0 Edge Detection + Programming TIP TC0 Signal Output to the TCLO0 Pin TC0 Clock Frequency OutputTREF0,EA EA,#4CH TMOD0,EA Bits TOE0 TREF0,EA EA,#0CH TMOD0,EA TC0 External Input Signal DividerTC0 Serial I/O Clock Generation TC0 Mode Register TMOD0 TMOD0.6, TMOD0.5, and TMOD0.4 Bit Settings TMOD0.6 TMOD0.5 TMOD0.4Resulting Counter Source and Clock Frequency + Programming TIP Restarting TC0 Counting Operation TC0 Timing Diagram TC0 Counter Register TCNT0 TC0 Output Enable Flag TOE0 TC0 Reference Register TREF0MSB LSB TC0 Output Latch TOL0 + Programming TIP Setting a TC0 Timer Interval TREF0,EA Clock Source Generation for LCD Controller Using a System or Subsystem Clock SourceReal-Time and Watch-Time Measurement Buzzer Output Frequency Generator Timing Tests in High-Speed ModeCheck Subsystem Clock Level Feature Watch Timer Circuit Diagram Watch Timer Mode Register Wmod Clock Btstz Irqw + Programming TIP Using the Watch TimerWMOD,EA Bits IEW LCD CONTROLLER/DRIVER Data BUS LCD Controller Driver LCD Circuit Diagram LCD Circuit Diagram LCD RAM Address Area LCON.0 and LMOD.3 Bit Settings LCD Control Register LconLCON.0 LMOD.3 COM0-COM3 SEG0-SEG31 P8.0-P8.7 LMOD.3 LMOD.2 LMOD.1 LMOD.0 LCD Mode Register LmodLMOD.5 LMOD.4 LCD Power Supply Static Mode Bias LCD Drive VoltageGND LCD Voltage Dividing Resistors Voltage Dividing Resistor Circuit Diagrams Common COM Signals LCD Common Signal Waveform Static LCD Common Signal Waveform at 1/2 Bias 1/2, 1/3 Duty LCD Common Signal Waveform at 1/3 Bias 1/3, 1/4 Duty Segment SEG Signals Select/No-Select Signals for LCD Static Display ModeSEG Select No-select Select/No-Select Signals for LCD 1/2 Bias Display Mode Select Non-select Select/No-Select Signals for LCD 1/3 Bias Display Mode 10. Select/No-select Bias Signals in 1/3 Bias Display Mode 11. LCD Signal Waveforms in Static Mode COM0 SEG11 SEG12 VLC0 VSS +VLCD 0 Vlcd 12. LCD Connection Example in Static Mode 13. LCD Signal Waveforms at 1/2 Duty, 1/2 Bias COM0 COM1 SEG9 14. LCD Connection Example at 1/2 Duty, 1/2 Bias 15. LCD Signal Waveforms at 1/3 Duty, 1/2 Bias COM0 COM1 COM2 SEG12 16. LCD Connection Example at 1/3 Duty, 1/2 Bias 17. LCD Signal Waveforms at 1/3 Duty, 1/3 Bias 18. LCD Connection Example at 1/3 Duty, 1/3 Bias 19. LCD Signal Waveforms at 1/4 Duty, 1/3 Bias COM0 COM1 COM2 COM3 SEG13 20. LCD Connection Example at 1/4 Duty, 1/3 Bias 12-24 Serial I/O Interface Serial I/O Operation Sequence Serial I/O Interface Circuit Diagram Serial I/O Mode Register Smod SMOD.0SMOD.1 SMOD.2 Serial I/O Timing Diagrams SIO Timing in Transmit/Receive Mode Serial I/O Buffer Register Sbuf SBUF,EA EA,#0EEH SMOD,EABitr EMB EA,TDATA SBUF,EA EA,#4FH SMOD,EA SBUF,EA EA,#8FH SMOD,EA Bits IES Ints PushXCH EA,SBUF Bits SMOD.3 SBUF,EA EA,#0FH SMOD,EA High Speed SIO Transmission 13-8 Standard Electrical Characteristics Stop Mode Characteristics and Timing WaveformsElectrical Data Miscellaneous Timing Waveforms Parameter Symbol Conditions Rating Units D.C. Electrical CharacteristicsParameter Symbol Conditions Min Typ Max Units Absolute Maximum Ratings Output low D.C. Electrical Characteristics Concluded Stop mode DD = 5 V ± 10% CPU = fx/4, Scmod = 0100B Main System Clock Oscillator Characteristics Input/Output Capacitance Subsystem Clock Oscillator CharacteristicsParameter Symbol Condition Min Typ Max Units A.C. Electrical Characteristics Input Width Parameter Symbol Conditions Min Typ Max Unit Released by Reset 17/fx Time Released by interrupt Timing Waveforms A.C. Timing Measurement Points Except for XIN and Xtin TCL0 Timing 10. Serial Data Transfer Timing QFP-1420C Package Dimensions Mechanical Data 15-2 16 KS57P2308/P2316 OTP KS57P2308/KS57P2316 Test Operating Mode CharacteristicsREG 16-4 16-5 KS57P2308/P2316 OTPKS57C2308/P2308/C2316/P2316 16-7 16-8 16-9 16-10 Timing Waveforms 16-12 16-13 11. Serial Data Transfer Timing 12. OTP Programming Algorithm KS57P2308/P2316 OTP KS57C2308/P2308/C2316/P2316 16-16 Shine Sama AssemblerSASM57 HEX2ROM Smds Product Configuration SMDS2+ 17-2 TB572308A/16A Target Board Xtal MDS SMDS2/SMDS2+ Stop LED XTIIdle LED Pin Connectors for TB572308A/16A DIP KS57 Series Mask ROM Order Form Page KS57 Series Request for Production AT Customer Risk Risk Order InformationCustomer Risk Order Agreement Order Quantity and Delivery SchedulePage KS57C2308 Mask Option Selection Form Attachment Check oneProm Customer Checksum Company Name Signature EngineerPage KS57C2316 Mask Option Selection Form + What is the purpose of this order? KS57 Series OTP Factory Writing Order Form 1/2Page KS57P2308 OTP Factory Writing Order Form 2/2 Device Number+ Are you going to continue ordering this device? If so, how much will you be ordering? PCSPage KS57P2316 OTP Factory Writing Order Form 2/2