Samsung S3C84E5 RET

INSTRUCTION SET S3C84E5/C84E9/P84E9

6-70

RET — Return

RET

Operation: PC ← @SP

SP ← SP + 2

The RET instruction is normally used to return to the previously executed procedure at the end of

the procedure entered by a CALL instruction. The contents of the location addressed by the stack

pointer are popped into the program counter. The next statement to be executed is the one that is

addressed by the new program counter value.

Flags: No flags are affected.

Format:

Bytes Cycles Opcode

(Hex)

opc 1 10 AF

Example: Given: SP = 00FCH, (SP) = 101AH, and PC = 1234:

RET → PC = 101AH, SP = 00FEH

The RET instruction pops the contents of the stack pointer location 00FCH (10H) into the high byte

of the program counter. The stack pointer then pops the value in the location 00FEH (1AH) into the

PC's low byte and the instruction at the location 101AH is executed. The stack pointer now points

to the memory location 00FEH.

Contents

Main USER'S MANUAL ERRATA ERRATA (VER 1.1) 1. Features (PAGE 1-2) 2. Low Voltage Reset (PAGE 16-1) 3. Low Voltage Reset (PAGE 16-2) Figure 16-1. Low Voltage Reset Circuit 4. Table 17-3. D.C. Electrical Characteristics (PAGE 17-3) 5. Table 17-3. D.C. Electrical Characteristics (PAGE 17-4) 6. Table 17-4. A.C. Electrical Characteristics (PAGE 17-5) 7. Table 17-5. Main Oscillator Frequency (PAGE 17-6) 8. Table 17-6. Main Oscillator Clock Stabilization Time(PAGE 17-6) 9. Table 17-7. Sub Oscillator Frequency (PAGE 17-7) 10. Table 17-8. Subsystem Oscillator (crystal) Stabilization Time (PAGE 17-7) 11. Table 17-9. Data Retention Supply Voltage in Stop Mode (PAGE 17-8) 12. Table 17-10. UART Timing Characteristics in Mode 0 (PAGE 17-10) 13. Table 17-11. A/D Converter Electrical Characteristics (PAGE 17-11) 14. Table 17-12. LVR (Low Voltage Reset) Circuit Characteristics (PAGE 17-12) 15. Figure 17-8. Operating Voltage Range(PAGE 17-12) 16. Table 19-2. Comparison of S3P84E9 and S3C84E5/C84E9 Features (PAGE 17-12) Page Important Notice Preface Table of Contents Part I Programming Model Chapter 1 Product Overview Chapter 2 Address Spaces Chapter 3 Addressing Modes Chapter 4 Control Registers Chapter 5 Interrupt Structure Chapter 6 Instruction Set Part II Hardware Descriptions Chapter 7 Clock Circuit Chapter 8 RESET and Power-Down Chapter 9 I/O Ports Chapter 10 Basic Timer Chapter 11 8-bit Timer A/B Chapter 12 16-bit Timer 1(0, 1) Chapter 13 UART Chapter 14 Watch Timer Page List of Figures List of Figures (Continued) List of Figures (Concluded) Page List of Tables List of Programming Tips List of Register Descriptions List of Instruction Descriptions List of Instruction Descriptions (Continued) 1 S3C8-SERIES MICROCONTROLLERS S3C84E5/C84E9/P84E9 MICROCONTROLLER FEATURES S3C84E5/C84E9/P84E9 PRODUCT OVERVIEW 1-3 BLOCK DIAGRAM Watch Timer Xout, XTout Figure 1-1. S3C84E5/C84E9/P84E9 Block Diagram PRODUCT OVERVIEW S3C84E5/C84E9/P84E9 PIN ASSIGNMENT S3C84E5 S3C84E9 S3P84E9 Top View (44-QFP) Figure 1-2. S3C84E5/C84E9/P84E9 Pin Assignment (44-pin QFP) S3C84E5/C84E9/P84E9 PRODUCT OVERVIEW PIN ASSIGNMENT S3C84E5 S3C84E9 S3P84E9 Top View (42-SDIP) Figure 1-3. S3C84E5/C84E9/P84E9 Pin Assignment (42-pin SDIP) PIN DESCRIPTIONS Page PIN CIRCUITS Page Figure 1-8. Pin Circuit Type E (P3) Figure 1-9. Pin Circuit Type F (P0.0, P0.1) 2 PROGRAM MEMORY (ROM) REGISTER ARCHITECTURE ADDRESS SPACES S3C84E5/C84E9/P84E9 2-4 Figure 2-2. Internal Register File Organization Page F Page Page ~ ~ Page F REGISTER ADDRESSING S3C84E5/C84E9/P84E9 ADDRESS SPACES 2-13 Figure 2-9. Register File Addressing Page F ADDRESS SPACES S3C84E5/C84E9/P84E9 2-16 Figure 2-11. 4-Bit Working Register Addressing Figure 2-12. 4-Bit Working Register Addressing Example Page ADDRESS SPACES S3C84E5/C84E9/P84E9 2-18 Figure 2-14. 8-Bit Working Register Addressing Example SYSTEM AND USER STACK Page 3 ADDRESSING MODES S3C84E5/C84E9/P84E9 3-2 REGISTER ADDRESSING MODE (R) Figure 3-1. Register Addressing Figure 3-2. Working Register Addressing INDIRECT REGISTER ADDRESSING MODE (IR) ADDRESSING MODES S3C84E5/C84E9/P84E9 3-4 Figure 3-4. Indirect Register Addressing to Program Memory ~ ~ ~ ~ Figure 3-5. Indirect Working Register Addressing to Register File ADDRESSING MODES S3C84E5/C84E9/P84E9 3-6 Figure 3-6. Indirect Working Register Addressing to Program or Data Memory INDEXED ADDRESSING MODE (X) ~ ~ ~ ~ + ADDRESSING MODES S3C84E5/C84E9/P84E9 + 3-8 INDEXED ADDRESSING MODE (Continued) ~ ~ Figure 3-8. Indexed Addressing to Program or Data Memory with Short Offset + ~ ~ Figure 3-9. Indexed Addressing to Program or Data Memory DIRECT ADDRESS MODE (DA) DIRECT ADDRESS MODE (Continued) INDIRECT ADDRESS MODE (IA) RELATIVE ADDRESS MODE (RA) + IMMEDIATE MODE (IM) 4 Page Page FLAGS - System Flags Register D5H Set 1 Figure 4-1. Register Description Format ADCON BTCON CLKCON FLAGS IMR IPH IPL IPR IRQ OSCCON P0CONH P0CONL P1CONH P1CONL P2CONH P2CONL P2INT P2INTPND P3CONH P3CONL P4CONH P4CONL P4INT P4INTPND PP RP0 RP1 SPH SPL STPCON Stop Control Register E5H Set 1, Bank 0 SYM T1CON0 T1CON1 TACON TBCON TINTPND UARTCON Page UARTPND WTCON 5 Page Page INTERRUPT STRUCTURE S3C84E5/C84E9/P84E9 5-4 Figure 5-2. S3C84E5/C84E9/P84E9 Interrupt Structure Page Page Page Page Page Page Page Page Figure 5-8. Interrupt Priority Register (IPR) Page Page Page Page 6 Page Page Page Page Page Page Page Page Page Page Page Page ADC ADD AND BAND BCP BITC BITR BITS BOR BTJRF BTJRT BXOR CALL CCF CLR COM CP CPIJE CPIJNE Page DA DEC DECW DI DIV DJNZ EI ENTER EXIT IDLE INC INCW IRET JP JR Page LD LDB Page LDC/LDE LDCD/LDED LDCI/LDEI LDCPD/LDEPD LDCPI/LDEPI LDW MULT NEXT NOP OR POP POPUD POPUI PUSH PUSHUD Push User Stack (Decrementing) PUSHUI RCF RET RL RLC RR RRC SB0 SB1 SBC SCF SRA SRP/SRP0/SRP1 STOP SUB SWAP TCM TM WFI XOR 7 CLOCK CIRCUIT S3C84E5/C84E9/P84E9 7-2 Figure 7-3. System Clock Circuit Diagram Page Figure 7-5. Oscillator Control Register (OSCCON) STOP Control Register (STPCON) Figure 7-6. STOP Control Register (STPCON) 8 SYSTEM RESET Page Page Page POWER-DOWN MODES Page 9 Page Page I/O PORTS S3C84E5/C84E9/P84E9 9-4 Figure 9-2. Port 0 Low Byte Control Register (P0CONL) Page I/O PORTS S3C84E5/C84E9/P84E9 9-6 Figure 9-4. Port 1 Low-Byte Control Register (P1CONL) Page Figure 9-5. Port 2 High-Byte Control Register (P2CONH) Figure 9-6. Port 2 Low-Byte Control Register (P2CONL) Figure 9-7. Port 2 Interrupt Pending Register (P2INTPND) Figure 9-8. Port 2 Interrupt Control Register (P2INT) Page Figure 9-10. Port 3 Low-Byte Control Register (P3CONL) Page Figure 9-11. Port 4 High-Byte Control Register (P4CONH) Figure 9-12. Port 4 Low-Byte Control Register (P4CONL) Figure 9-13. Port 4 Interrupt Pending Register (P4INTPND) Figure 9-14. Port 4 Interrupt Control Register (P4INT) 10 BASIC TIMER S3C84E5/C84E9/P84E9 10-2 Figure 10-1. Basic Timer Control Register (BTCON) Page Page 11 8-BIT TIMER A Page Page BLOCK DIAGRAM Figure 11-2. Timer A Functional Block Diagram 8-BIT TIMER B TIMER B CONTROL REGISTER (TBCON) Figure 11-4. Timer B Control Register (TBCON) Figure 11-5. Timer B Data Registers (TBDATAH, TBDATAL) Page Figure 11-6. Timer B Output Flip Flop Waveforms in Repeat Mode Page Page Page F 12 Page Page Figure 12-1. Timer 1(0,1) Control Register (T1CON0, T1CON1) Figure 12-2. Timer A, Timer 1(0,1) Pending Register (TINTPND) 16-BIT TIMER 1(0,1) S3C84E5/C84E9/P84E9 12-6 BLOCK DIAGRAM Figure 12-3. Timer 1(0,1) Functional Block Diagram F 13 Page Figure 13-1. UART Control Register (UARTCON) Not used (must keep always 0) Page Page Page UART S3C84E5/C84E9/P84E9 13-8 BLOCK DIAGRAM Figure 13-5. UART Functional Block Diagram Page Page Page UART S3C84E5/C84E9/P84E9 13-12 Figure 13-8. Timing Diagram for UART Mode 2 Operation Page Page 14 Page WATCH TIMER CIRCUIT DIAGRAM Figure 14-1. Watch Timer Circuit Diagram F 15 OVERVIEW FUNCTION DESCRIPTION Page S3C84E5/C84E9/P84E9 A/D CONVERTER 15-3 Figure 15-2. A/D Converter Data Register (ADDATAH, ADDATAL) Figure 15-3. A/D Converter Circuit Diagram Page Page F 16 Page 17 Page Page Page Page Page Page ELECTRICAL DATA S3C84E5/C84E9/P84E9 17-8 A Figure 17-4. Stop Mode Release Timing Initiated by RESET Figure 17-5. Stop Mode (Main) Release Timing Initiated by Interrupts Figure 17-6. Stop Mode (Sub) Release Timing Initiated by Interrupts Page Page Page 18 The S3C84E5/C84E9/P84E9 microcontrollers are available in a 42-SDIP-600, 44-QFP-1010 package. 42-SDIP-600 Figure 18-1. 42-SDIP-600 Package Dimensions MECHANICAL DATA S3C84E5/C84E9/P84E9 44-QFP-1010 18-2 Figure 18-2. 44-QFP-1010 Package Dimensions 19 S3P84E9 (42-SDIP) Figure 19-1. S3P84E9 Pin Assignments (42-SDIP Package) OTP VERSION S3C84E5/C84E9/P84E9 19-2 S3P84E9 (44-QFP) Figure 19-2. S3P84E9 Pin Assignments (44-QFP Package) Page Page 20 Page S3C84E5/C84E9/P84E9 DEVELOPMENT TOOLS 20-3 TB84E5/84E9 Figure 20-2. S3C84E5/S3C84E9/S3P84E9 Target Board Configuration Page Table 20-3. The Port 0.0 and Port 0.1 selection setting Sub-OSC Setting Description 44-PIN DIP SOCKET Figure 20-3. 44-Pin Connector Pin Assignment for TB84E5/84E9 Page S3C8- SERIES MASK ROM ORDER FORM @ : Assembly site code, Y : Last number of assembly year, WW : Week of assembly @ YWW Device Name SEC Device Name @ YWW @ YWW S3C8- SERIES REQUEST FOR PRODUCTION AT CUSTOMER RISK S3C84E5/C84E9 MASK OPTION SELECTION FORM F