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UPD784938A Datasheet(PDF) 10 Page - NEC |
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UPD784938A Datasheet(HTML) 10 Page - NEC |
10 / 52 page µPD78F4938A 10 Data Sheet U14118EJ1V0DS 4. PIN FUNCTIONS 4.1 Port Pins (1/2) Pin Name I/O Alternate Function Function P00 to P07 I/O — P10 I/O — P11 — P12 ASCK2/SCK2 P13 RxD2/SI2 P14 TxD2/SO2 P15 to 17 — P20 Input NMI P21 INTP0 P22 INTP1 P23 INTP2/CI P24 INTP3 P25 INTP4/ASCK/SCK1 P26 INTP5 P27 SI0 P30 I/O RxD/SI1 P31 TxD/SO1 P32 SCK0 P33 SO0 P34 to P37 TO0 to TO3 P40 to P47 I/O AD0 to AD7 P50 to P57 I/O A8 to A15 P60 to P63 I/O A16 to A19 P64 RD P65 WR P66 WAIT/HLDRQ P67 REFRQ/HLDAK Port 0 (P0): • 8-bit I/O port. • Can be used as real-time output port (4 bits × 2). • Input/output can be specified in 1-bit units. • An on-chip pull-up resistor can be specified by means of software for pins in input mode. • Can drive transistor. Port 1 (P1): • 8-bit I/O port. • Input/output can be specified in 1-bit units. • An on-chip pull-up resistor can be specified by means of software for pins in input mode. • Can drive LED. Port 2 (P2): • 8-bit input port. • P20 cannot be used as general-purpose port pin (non-maskable interrupt). However, input level can be checked by interrupt routine. • An on-chip pull-up resistor can be specified for P22 to P27 by means of software in 6-bit units. • P25/INTP4/ASCK/SCK1 pin operates as SCK1 I/O pin if so specified by CSIM1. Port 3 (P3): • 8-bit I/O port. • Input/output can be specified in 1-bit units. • An on-chip pull-up resistor can be specified by means of software for pins in input mode. • P32 and P33 can be specified for N-ch open-drain connection. Port 5 (P5): • 8-bit I/O port. • Input/output can be specified in 1-bit units. • An on-chip pull-up resistor can be specified by means of software for pins in input mode. • Can drive LED. Port 4 (P4): • 8-bit I/O port. • Input/output can be specified in 1-bit units. • An on-chip pull-up resistor can be specified by means of software for pins in input mode. • Can drive LED. Port 6 (P6): • 8-bit I/O port. • Input/output can be specified in 1-bit units. • An on-chip pull-up resistor can be specified by means of software for pins in input mode. |
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