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UPD784938 Datasheet(PDF) 51 Page - NEC |
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UPD784938 Datasheet(HTML) 51 Page - NEC |
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51 / 733 page  51 Preliminary User’s Manual U13987EJ1V0UM00 CHAPTER 2 PIN FUNCTIONS 2.1 Pin Function Lists 2.1.1 Normal operation mode (1) Port pins (1/2) Pin Name Input/Output Alternate Function Function P00 to P07 Input/output — Port 0 (P0): • 8-bit input/output port • Can be used as real-time output ports (4 bits × 2) • Input/output can be specified in 1-bit units • For input mode pins, on-chip pull-up resistor connection can be specified at once by means of software • Transistor drive capability P10 Input/output — P11 — P12 ASCK2/SCK2 P13 RxD2/SI2 P14 TxD2/SO2 P15 to P17 — P20 Input NMI P21 INTP0 P22 INTP1 P23 INTP2/CI P24 INTP3 P25 INTP4/ASCK/SCK1 P26 INTP5 P27 SI0 P30 Input/output RxD/SI1 P31 TxD/SO1 P32 SCK0 P33 SO0 P34 to P37 TO0 to TO3 Port 1 (P1): • 8-bit input/output port • Input/output can be specified in 1-bit units • For input mode pins, on-chip pull-up resistor connection can be specified at once by means of software • LED drive capability Port 2 (P2): • 8-bit input/output port • P20 cannot be used as a general-purpose port (non-maskable interrupt). Input level can be confirmed in the interrupt routine. • For P22 to P27, on-chip pull-up resistor connection can be specified by means of software in 6-bit units • The P25/INTP4/ASCK/SCK1 pin operates as the SCK1 output pin in accordance with the CSIM1 register specification Port 3 (P3): • 8-bit input/output port • Input/output can be specified in 1-bit units • For input mode pins, on-chip pull-up resistor connection can be specified at once by means of software • P32 and P33 can be set in N-ch open-drain mode |
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