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NEC PD75402A, PD75P402 user manual 5 3-Wire Serial I/O Mode Operation

Models: PD75402A PD75P402

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CHAPTER 5. PERIPHERAL HARDWARE FUNCTIONS

Serial clock selection bit (W)

The P01/SCK pin status depends on the CSIM1 setting as shown below.

CSIM1

P01/SCK Pin Status

0

High impedance

1

High level

The following procedure should be used to clear CSIE during a serial transfer.

➀Clear the interrupt enable flag (IECSI) to set the interrupt disabled state.

➁Clear CSIE.

➂Clear the interrupt request flag (IRQCSI).

5.5.53-Wire Serial I/O Mode Operation

The 3-wire serial I/O mode allows connection to the system used in the 75X series, μPD7500 series, 87AD series, etc.

Communication is performed using three lines: The serial clock (SCK), serial output (SO), and serial input (SI).

Fig. 5-28 Example of 3-Wire Serial I/O System Configuration

	3-wire serial I/O ↔ 3-wire serial I/O
Master CPU	Slave CPU

SCK

➤SCK

SO

➤

SI

SI

➤

SO

(1) Register setting

When the device is used in the 3-wire serial I/O mode, setting can be performed by means of the following two registers:

•Serial operating mode register (CSIM)

•Serial bus interface control register (SBIC)

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Image 95

NEC PD75402A, PD75P402 user manual 5 3-Wire Serial I/O Mode Operation, Example of 3-Wire Serial I/O System Configuration

Contents

ΜPD75402A Page Major Revisions in This Version Remarks Content to be read carefullyInstruction Functions and Application Latest documents should be used for design purposes, etc Related Documentation Device Related DocumentsDevelopment Tool Related Documents Other Related DocumentsContents Clock Generation Circuit Basic Interval TimerInterrupt Control Circuit Configuration Digital INPUT/OUTPUT PortsStandby Mode Application Standby Mode Setting and Operation StatesStandby Mode Reset Operation After Standby Mode ResetContents of Figures Fig. No Title Table No Title Contents of TablesECR VCR GeneralFAX PPC For details, see Interrupt Functions General Outline of FunctionsQuality Grade General Ordering Information and Quality GradeOrdering Information VPP PORT6 Block DiagramPORT0 PORT1 PORT2 PORT3 PORT5 INT0 Interrupt INT2 ControlVPP NC General PIN ConfigurationSCK SO/SB0Prom mode NC V SS NC P22/PCL 2 44-Pin Plastic QFP 10mm Normal operating modeNC NC NC P50 P01/SCKA2 NC NC NC NC PIN Functions INT0 ΜPD75402A PIN Function List Port Pin ListSCK SO/SB0SCK SB0 Port 0’s, 1’s Dual-Function Pins PIN Functions Normal Operating ModePCL ..... Port 2 Dual-Function Output 4 INT0 ..... Port 1 Dual-Function Input5 INT2 ..... Port 1 Dual-Function Input 7 X1, X2 Crystal Reset Reset1 A0 to A14 Address ..... Input PIN Functions Prom ModeCE Chip Enable ..... Input OE Output Enable ..... InputP22/PCL PIN Functions PIN INPUT/OUTPUT CircuitsPin Input/output Types Remarks a circleIN/OUT OUTType F B Type M a PIN Functions Unused PIN Treatment P00, ResetData Memory Bank Configuration Features of Architecture and Memory MAPFF0H Fffh FB0HFbfh @HL Addressing Mode ListBit direct addressing mem Data Memory Addressing ModesBit direct addressing mem.bit Bit register indirect addressing @HL Specific address bit manipulation addressing fmem. bit Push HL Push XA RET Stack addressingSUB Push POP RET Push HL POPApplicable Addressing Modes at Peripheral Hardware Operation Features of Architecture and Memory MAP MEMORY-MAPPED I/OΜPD75402A I/O Map 1/2 ΜPD75402A I/O Map 2/2 PC1 PC0 Internal CPU FunctionsProgram Counter PC .... Bits Program Memory Map Program Memory ROM .... ,920 Words × 8 BitsStack area Internal CPU Functions Data Memory RAMData area General register areaPeripheral hardware area Internal CPU Functions General Register .... × 4 Bits General Register ConfigurationAccumulators Internal CPU Functions AccumulatorSP4 SP3 SP2 SP1 SP0 Internal CPU Functions Stack Pointer SP .... BitsRange of 020H to 03FH MOV SP, XAIST0 PSW Data Saved to Stack MemoryCarry Flag Manipulation Instructions Internal CPU Functions Program Status Word PSW .... BitsCarry flag CY Interrupt status flag IST0 Interrupt Status Flag Indication ContentSET1 Skip flag SK2, SK1, SK0PORT0 Peripheral Hardware FunctionsDigital Input/Output Port Types and Characteristics INT2 INT0 Csim PogaPO0 PO1PO3 Configuration of PortConfiguration of Ports 2 PM5 Pmgb Input/Output Mode SettingFech PM5 PM2 Pmgb Digital Input/Output Port Handling InstructionsPmga Bit handling instructions Digital Input/Output Port Operations Operations when input mode is setOperations when output mode is set Operations with Input/Output Port Handling Instructions Internal Pull-up Resistors Internal Pull-Up Resistor Specification for Each PortFdch PO6 PO3 PO2 PO1 PO0 MOV POGA, XAPORT1 Data latching by 2-machine-cycle instruction Digital Input/Output Port Input/Output TimingData fetch by 2-machine-cycle instruction Data latching by 1-machine-cycle instructionPeripheral Hardware Functions Clock Generation Circuit Clock Generation Circuit ConfigurationMOV PCC, a Clock Generation Circuit Function and OperaionProcessor clock control register PCC SELPCC FB3H PCC3 PCC2 PCC1 PCC012 System Clock Oscillation Circuit External Circuitry System clock oscillation circuit13 Example of Poor Resonator Connection Circuit 2/2 Example CPU Clock SettingUse of Variable Minimum Instruction Execution Time Function Maximum Time Required for Change of CPU Clock 15 Change of Φ after Power-On ResetDifferences Between μPD75402A and μPD75402 FB3H PCC3 PCC2 PCC1 17 μPD75402 Processor Clock Control Register FormatP22/PCL CLOM3 CLOM1 CLOM0 Clom PORT2.2 Clock Output Circuit ConfigurationPeripheral Hardware Functions Clock Output Circuit Clom Clock Output Mode Register ClomExamle of Remote Control Application Clock Output ProcedureBTM3 BTM2 Peripheral Hardware Functions Basic Interval TimerBasic Interval Timer Configuration MPXBTM Basic Intercal Timer Mode Register BTMMOV BTM. a BTM3From the beginning Basic Interval Timer OperationSEL MOV Examples of Basic Interval Timer ApplicationsMOV BTM,A IebtSerial Interface Functions Operation-halted modeWire serial I/O mode Peripheral Hardware Functions Serial InterfaceSerial Interface Configuration SBI mode serial bus interface modeFunctions Serial Interface Block DiagramSO latch Serial operating mode register CsimSerial bus interface control register Sbic Shift register SIOSerial clock control circuit Register Functions Serial operating mode register CsimIntcsi control circuit Csie COI WUP CSIM3 CSIM1 Csim Serial interface operating mode selection bit WSerial clock selection bit W Csie Signal from address comparator RCsie CSIM1 MOV CSIM, XASET1 Csie Csie CSIM3Cmdd Reld Cmdt Relt FE2HAcknowledge trigger bit W Command trigger bit WCommand detection flag R Bus release detection flag RAcknowledge detection flag R Busy enable bit R/WBUSY/ACK SIOCLK Slave address detection Error detectionSee 5.5.6 8 Error detection for details Slave address register SVACsie C0I WUP CSIM3 CSIM1 Csim Register setting28 Example of 3-Wire Serial I/O System Configuration 5 3-Wire Serial I/O Mode OperationRemarks Figuer Apply to fXX = 4.19 MHz operation Shift register data do not match Register data match FE2H Bsye Ackd Acke Ackt Cmdd Reld Cmdt Relt Sbic Command trigger bitCommunication operation 29 3-Wire Serial I/O Mode TimingRelt Cmdt Serial Clock Selection and Use in 3-Wire Serial I/O ModeSignals Serial clock selectionStart of transfer Data transfer orderSCK SO/SB0 Wire serial I/O mode applicationsMOV XA, Tdata MOV SIO, XAMOV RDATA, XA MOV XA, Tdata SIO, XAIecsi MOV XA, Tdata XCH XA, SIOSB0 SCK SBI Mode Operation+ VDD CPU SB0 SCKSBI functions Address/command/data differentiation functionAcknowledge signal ACK control function Busy signal Busy control functionSB0 D0 ACK Busy SBI definitionSB0 ACK SB0 C0 ACK BusySCK H SB0 Bus release signal RELCommand signal CMD SCK H37 Slave Selection by Address AddressData Command & dataSCK SB0 ACK Acknowledge signal ACKSCK SB0 ACK Busy Busy signal BUSY, ready signal Ready100 101 102 103 104 105 Serial Clock Selection and Use in SBI ModeSIO SCK RELT, CMDT, Reld & Cmdd Operation Slave106 SIO SCK SB0 Relt Cmdt Reld Cmdd107 44 Ackt Operation108 When Acke is set after completion of transferWhen Acke = 0 on completion of transfer When Acke = 1 interval is shortSCK SB0 Bsye ACK When ACK signal is output after 9th SCK clock interval109 SCK SB0 ACK AckdSB0 Ready 110 Signals in SBI ModeSCK Cmdd SB0 ACK ReadyREL CMD 111Pin Configuration Diagram Pin configuration113 Address match detection methodUse of slave address register SVA Hardware 114Chapter Peripheral115 50 Command Transmission from Master Device to Slave51 Data Transmission from Master Device to Slave Device 116117 52 Data Transmission from Slave Device to Master Device118 Points to note concerning SBI mode119 SBI mode applicationSerial bus configuration 120 Description of commands Command typesIi Communication procedure 121 Iii Command formats➀ Read command ➁ WRITE, END and Stop commandsACK Stop 122MSM MSB LSB ➂ Status command123 StatusChgmst Reset command➄ Chgmst command 124125 Iv Error occurrenceErrors generated on the slave side Errors generated on the master sideInterrupt Functions 127 VENT1 Gotobt VENT2 GOTO0 Interrupt Functions Interrupt Source Types and Vector TableInterrupt Request Source Types VEN T1 GOT OBTIE0 Interrupt request flag & interrupt enable flagInterrupt Request Flag Setting Signal Example EI130 External interrupt input pin hardwareINT2 Input Noise Elimination INT0 Noise Elimination Circuit Input/Output TimingFB2H Interrupt master enable flag IME132 FB4H IM03133 Interrupt status flagIST0 Interrupt Servicing Status IME=1 Interrupt Functions Interrupt SequenceYES Interrupt INTxxx generation 136 EI Iecsi Interrupt Functions Interrupt ApplicationsInterrupt enabling/disabling ➄ Reti Example using INTBT, INT0 falling edge active, and Intcsi138 CLR1 IRQ0➃ EI Iecsi Reti 139EI IE0 ➂ Intcsi RetiINT0 Intcsi ➁ Reti Pending interrupt execution140 Standby Function Stop modeHalt mode Standby Mode Operation States Standby Function Standby Mode Setting and Operation StatesHalt mode reset by interrupt generation Standby Function Standby Mode ResetStop mode reset by Reset input Halt mode reset by Reset inputHalt 144IME = Standby Function Operation After Standby Mode ResetReset at Power-on Reset Signal AcceptanceOFF State of Hardware after Reset147 148 Architecture and Memory MAPExample A0 Instruction SET Special InstructionsBit Manipulation Instructions Stack InstructionsAdds Addc Base Correction InstructionsBase correction at addition AddcOperation description legend Instruction SET Instruction SET and ITS OperationOperation identifier and description 152 Description of addressing area field symbolsDescription of machine cycle field XOR Movt XA, @PCXAAdds Addc154 NOP Instruction GroupInstructions 155Iebt Iecsi IE0 IE2 Description of operation code symbolsInstruction SET Operation Code of Each Instruction Bit manipulation addressing operation codeSET CLR SKT Not Rorc Not IncsHalt Stop NOP RET Rets Reti Push POPMOV HL, #5FH Instruction SET Instruction Functions and ApplicationMove Instructions MOV A, #0BH160 MOV XA, 20H161 Loop XCHMOV XCH 02FFH Table Reference InstructionsTable data on that 162163 Arithmetic and Logic InstructionsSee section 164 Or A, @HL165 Rorc a166 Incs reg167 SKE reg, #n4168 Carry Flag Operation Instructions169 Bit Manipuration Instructions170 SKF mem. bit171 BR addr172 Subroutine Stack Control Instructions173 Push rp174 Interrupt Control Instructions175 Input/Output Instructions176 Halt177 178 179 Language ProcessorProm Writing Tools 180 Debugging ToolsIBM PC/AT Development Tool Configuration181 182 183 Port 184Irqcs Pmgb Cmdd