PIN Functions Unused PIN Treatment, P00, Reset | NEC PD75402A

CHAPTER 2. PIN FUNCTIONS

2.5UNUSED PIN TREATMENT

Pin		Recommended Connection Method

P00	Connect to VSS.

P01 to P03	•	With pull-up resistor Connect to VDD.

P10 and P12	•	Without pull-up resistor
		Connect to VSS or VDD.

P20 to P23	•	With pull-up resistor
		Input status: Connect to VDD.
P30 to P33		Output status: Leave open.
		Output status: Leave open.

P50 to P53	•	Without pull-up resistor
		Input status: Connect to VSS to VDD.
P60 to P63		Output status: Leave open.
		Output status: Leave open.

NC	Leave open or connect directly to VSS.*

*If using the μPD75P402 and the printed circuit board commonly, the NC pins should be connected directly to VSS.

2.6NOTES ON USE OF P00 PIN AND RESET PIN

The P00 and RESET pins are provided with the test mode setting function of test mode (for IC test) which tests the internal operation of the μPD75402A in addition to the functions described in 2.2.1 and 2.2.8.

When a voltage exceeding VDD is applied to either of these pins, the test mode is set. Consequently, if noise exceeding VDD is added even in a normal operation, the test mode is set and the normal operation may not be continued.

For example, when wires from the P00 pin or RESET pin are long, inter-wiring noise may be added to these pins and the pin voltage may exceed VDD, resulting in a misoperation.

Therefore, wiring should be carried out so that inter-wiring noise is suppressed as far as possible.

If it is impossible to suppress the noise, noise prevention measures by means of external parts should be taken as shown below.

o Insert diode with small	o Insert capacitor between
VF (less than 0.3 V)	VDD and P00/RESET pin.
between VDD and
P00/RESET pin.

Diode with Small VF

VDD

VDD

VDD

VDD

P00, RESET

P00, RESET

20

Image 31

NEC PD75402A, PD75P402 user manual PIN Functions Unused PIN Treatment, P00, Reset

Contents

ΜPD75402A Page Major Revisions in This Version Instruction Functions and Application Content to be read carefullyRemarks Latest documents should be used for design purposes, etc Related Documentation Device Related DocumentsDevelopment Tool Related Documents Other Related Documents Contents Clock Generation Circuit Basic Interval TimerInterrupt Control Circuit Configuration Digital INPUT/OUTPUT Ports Standby Mode Application Standby Mode Setting and Operation StatesStandby Mode Reset Operation After Standby Mode Reset Contents of Figures Fig. No Title Table No Title Contents of Tables FAX PPC GeneralECR VCR For details, see Interrupt Functions General Outline of Functions Ordering Information General Ordering Information and Quality GradeQuality Grade VPP PORT6 Block DiagramPORT0 PORT1 PORT2 PORT3 PORT5 INT0 Interrupt INT2 Control VPP NC General PIN ConfigurationSCK SO/SB0 Prom mode NC V SS NC P22/PCL 2 44-Pin Plastic QFP 10mm Normal operating modeNC NC NC P50 P01/SCK A2 NC NC NC NC PIN Functions INT0 ΜPD75402A PIN Function List Port Pin ListSCK SO/SB0 SCK SB0 Port 0’s, 1’s Dual-Function Pins PIN Functions Normal Operating Mode 5 INT2 ..... Port 1 Dual-Function Input 4 INT0 ..... Port 1 Dual-Function InputPCL ..... Port 2 Dual-Function Output 7 X1, X2 Crystal Reset Reset 1 A0 to A14 Address ..... Input PIN Functions Prom ModeCE Chip Enable ..... Input OE Output Enable ..... Input P22/PCL PIN Functions PIN INPUT/OUTPUT CircuitsPin Input/output Types Remarks a circle IN/OUT OUT Type F B Type M a PIN Functions Unused PIN Treatment P00, Reset Data Memory Bank Configuration Features of Architecture and Memory MAP Fbfh FB0HFF0H Fffh @HL Addressing Mode List Bit direct addressing mem.bit Data Memory Addressing ModesBit direct addressing mem Bit register indirect addressing @HL Specific address bit manipulation addressing fmem. bit Push HL Push XA RET Stack addressingSUB Push POP RET Push HL POP Applicable Addressing Modes at Peripheral Hardware Operation Features of Architecture and Memory MAP MEMORY-MAPPED I/O ΜPD75402A I/O Map 1/2 ΜPD75402A I/O Map 2/2 Program Counter PC .... Bits Internal CPU FunctionsPC1 PC0 Program Memory Map Program Memory ROM .... ,920 Words × 8 Bits Stack area Internal CPU Functions Data Memory RAMData area General register area Peripheral hardware area Internal CPU Functions General Register .... × 4 Bits General Register Configuration Accumulators Internal CPU Functions Accumulator SP4 SP3 SP2 SP1 SP0 Internal CPU Functions Stack Pointer SP .... BitsRange of 020H to 03FH MOV SP, XA IST0 PSW Data Saved to Stack Memory Carry flag CY Internal CPU Functions Program Status Word PSW .... BitsCarry Flag Manipulation Instructions Interrupt status flag IST0 Interrupt Status Flag Indication ContentSET1 Skip flag SK2, SK1, SK0 PORT0 Peripheral Hardware Functions Digital Input/Output Port Types and Characteristics INT2 INT0 Csim PogaPO0 PO1 PO3 Configuration of Port Configuration of Ports 2 PM5 Pmgb Input/Output Mode Setting Pmga Digital Input/Output Port Handling InstructionsFech PM5 PM2 Pmgb Bit handling instructions Operations when output mode is set Operations when input mode is setDigital Input/Output Port Operations Operations with Input/Output Port Handling Instructions Internal Pull-up Resistors Internal Pull-Up Resistor Specification for Each Port PORT1 MOV POGA, XAFdch PO6 PO3 PO2 PO1 PO0 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 instruction Peripheral Hardware Functions Clock Generation Circuit Clock Generation Circuit Configuration MOV PCC, a Clock Generation Circuit Function and OperaionProcessor clock control register PCC SEL PCC FB3H PCC3 PCC2 PCC1 PCC0 12 System Clock Oscillation Circuit External Circuitry System clock oscillation circuit 13 Example of Poor Resonator Connection Circuit 2/2 Use of Variable Minimum Instruction Execution Time Function CPU Clock SettingExample Maximum Time Required for Change of CPU Clock 15 Change of Φ after Power-On Reset Differences Between μPD75402A and μPD75402 FB3H PCC3 PCC2 PCC1 17 μPD75402 Processor Clock Control Register Format Peripheral Hardware Functions Clock Output Circuit Clock Output Circuit ConfigurationP22/PCL CLOM3 CLOM1 CLOM0 Clom PORT2.2 Clom Clock Output Mode Register Clom Examle of Remote Control Application Clock Output Procedure BTM3 BTM2 Peripheral Hardware Functions Basic Interval TimerBasic Interval Timer Configuration MPX BTM Basic Intercal Timer Mode Register BTMMOV BTM. a BTM3 From the beginning Basic Interval Timer Operation SEL MOV Examples of Basic Interval Timer ApplicationsMOV BTM,A Iebt Serial Interface Functions Operation-halted modeWire serial I/O mode Peripheral Hardware Functions Serial Interface Serial Interface Configuration SBI mode serial bus interface mode Functions Serial Interface Block Diagram SO latch Serial operating mode register CsimSerial bus interface control register Sbic Shift register SIO Intcsi control circuit Register Functions Serial operating mode register CsimSerial clock control circuit Serial clock selection bit W Serial interface operating mode selection bit WCsie COI WUP CSIM3 CSIM1 Csim Csie Signal from address comparator R Csie CSIM1 MOV CSIM, XASET1 Csie Csie CSIM3 Cmdd Reld Cmdt Relt FE2H Acknowledge trigger bit W Command trigger bit WCommand detection flag R Bus release detection flag R Acknowledge detection flag R Busy enable bit R/W CLK SIOBUSY/ACK Slave address detection Error detectionSee 5.5.6 8 Error detection for details Slave address register SVA Csie C0I WUP CSIM3 CSIM1 Csim Register setting 28 Example of 3-Wire Serial I/O System Configuration 5 3-Wire Serial I/O Mode Operation Remarks 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 bit Communication operation 29 3-Wire Serial I/O Mode Timing Relt Cmdt Serial Clock Selection and Use in 3-Wire Serial I/O ModeSignals Serial clock selection Start of transfer Data transfer order SCK SO/SB0 Wire serial I/O mode applicationsMOV XA, Tdata MOV SIO, XA MOV RDATA, XA MOV XA, Tdata SIO, XAIecsi MOV XA, Tdata XCH XA, SIO SB0 SCK SBI Mode Operation+ VDD CPU SB0 SCK SBI functions Address/command/data differentiation functionAcknowledge signal ACK control function Busy signal Busy control function SB0 D0 ACK Busy SBI definitionSB0 ACK SB0 C0 ACK Busy SCK H SB0 Bus release signal RELCommand signal CMD SCK H 37 Slave Selection by Address Address Data Command & data SCK SB0 ACK Acknowledge signal ACK 100 Busy signal BUSY, ready signal ReadySCK SB0 ACK Busy 101 102 103 104 105 Serial Clock Selection and Use in SBI Mode SIO SCK RELT, CMDT, Reld & Cmdd Operation Slave106 SIO SCK SB0 Relt Cmdt Reld Cmdd 107 44 Ackt Operation 108 When Acke is set after completion of transferWhen Acke = 0 on completion of transfer When Acke = 1 interval is short SCK SB0 Bsye ACK When ACK signal is output after 9th SCK clock interval109 SCK SB0 ACK Ackd SB0 Ready 110 Signals in SBI ModeSCK Cmdd SB0 ACK Ready REL CMD 111 Pin Configuration Diagram Pin configuration Use of slave address register SVA Address match detection method113 Hardware 114Chapter Peripheral 115 50 Command Transmission from Master Device to Slave 51 Data Transmission from Master Device to Slave Device 116 117 52 Data Transmission from Slave Device to Master Device 118 Points to note concerning SBI mode Serial bus configuration SBI mode application119 Ii Communication procedure Description of commands Command types120 121 Iii Command formats➀ Read command ➁ WRITE, END and Stop commands MSM 122ACK Stop MSB LSB ➂ Status command123 Status Chgmst Reset command➄ Chgmst command 124 125 Iv Error occurrenceErrors generated on the slave side Errors generated on the master side Interrupt Functions 127 VENT1 Gotobt VENT2 GOTO0 Interrupt Functions Interrupt Source Types and Vector TableInterrupt Request Source Types VEN T1 GOT OBT IE0 Interrupt request flag & interrupt enable flagInterrupt Request Flag Setting Signal Example EI 130 External interrupt input pin hardware INT2 Input Noise Elimination INT0 Noise Elimination Circuit Input/Output Timing FB2H Interrupt master enable flag IME132 FB4H IM03 IST0 Interrupt Servicing Status Interrupt status flag133 YES Interrupt Functions Interrupt SequenceIME=1 Interrupt INTxxx generation 136 Interrupt enabling/disabling Interrupt Functions Interrupt ApplicationsEI Iecsi ➄ Reti Example using INTBT, INT0 falling edge active, and Intcsi138 CLR1 IRQ0 ➃ EI Iecsi Reti 139EI IE0 ➂ Intcsi Reti 140 Pending interrupt executionINT0 Intcsi ➁ Reti Halt mode Stop modeStandby Function Standby Mode Operation States Standby Function Standby Mode Setting and Operation States Halt mode reset by interrupt generation Standby Function Standby Mode ResetStop mode reset by Reset input Halt mode reset by Reset input Halt 144 IME = Standby Function Operation After Standby Mode Reset Reset at Power-on Reset Signal Acceptance 147 State of Hardware after ResetOFF 148 Architecture and Memory MAP Example A0 Instruction SET Special InstructionsBit Manipulation Instructions Stack Instructions Adds Addc Base Correction InstructionsBase correction at addition Addc Operation identifier and description Instruction SET Instruction SET and ITS OperationOperation description legend Description of machine cycle field Description of addressing area field symbols152 XOR Movt XA, @PCXAAdds Addc 154 NOP Instruction GroupInstructions 155 Iebt Iecsi IE0 IE2 Description of operation code symbolsInstruction SET Operation Code of Each Instruction Bit manipulation addressing operation code SET CLR SKT Not Rorc Not Incs Halt Stop NOP RET Rets Reti Push POP MOV HL, #5FH Instruction SET Instruction Functions and ApplicationMove Instructions MOV A, #0BH 160 MOV XA, 20H MOV XCH Loop XCH161 02FFH Table Reference InstructionsTable data on that 162 See section Arithmetic and Logic Instructions163 164 Or A, @HL 165 Rorc a 166 Incs reg 167 SKE reg, #n4 168 Carry Flag Operation Instructions 169 Bit Manipuration Instructions 170 SKF mem. bit 171 BR addr 172 Subroutine Stack Control Instructions 173 Push rp 174 Interrupt Control Instructions 175 Input/Output Instructions 176 Halt 177 178 Prom Writing Tools Language Processor179 180 Debugging Tools 181 Development Tool ConfigurationIBM PC/AT 182 183 Port 184Irqcs Pmgb Cmdd