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UPD78F4937 Datasheet(PDF) 11 Page - NEC |
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UPD78F4937 Datasheet(HTML) 11 Page - NEC |
11 / 32 page Preliminary Product Information 11 µµµµPD78F4937 4. LIST OF PIN FUNCTIONS 4.1 Port Pins (1/2) Pin I/O Dual-function Function P00-P07 I/O − Port 0 (P0): • 8-bit I/O port. • Functions as a real-time output port (4 bits × 2). • Inputs and outputs can be specified bit by bit. • The use of pull-up resistors can be simultaneously specified by software for all pins in input mode. • Can drive a transistor. P10 − P11 − P12 ASCK2/SCK2 P13 RxD2/SI2 P14 TxD2/SO2 P15-P17 I/O − Port 1 (P1): • 8-bit I/O port. • Inputs and outputs can be specified bit by bit. • The use of pull-up resistors can be simultaneously specified by software for all pins in input mode. • Can drive LED. P20 NMI P21 INTP0 P22 INTP1 P23 INTP2/CI P24 INTP3 P25 INTP4/ASCK/SCK1 P26 INTP5 P27 Input SI0 Port 2 (P2): • 8-bit input-only port. • P20 does not function as a general-purpose port (nonmaskable interrupt). However, the input level can be checked by an interrupt service routine. • The use of pull-up resistors can be specified by software for pins P22 to P27 (in units of 6 bits). • The P25/INTP4/ASCK/SCK1 pin functions as the SCK1 I/O pin by CSIM1. P30 RxD/SI1 P31 TxD/SO1 P32 SCK0 P33 SO0 P34-P37 I/O TO0-TO3 Port 3 (P3): • 8-bit I/O port. • Inputs and outputs can be specified bit by bit. • The use of pull-up resistors can be simultaneously specified by software for all pins in input mode. • P32 and P33 can be set as the N-ch open-drain pin. P40-P47 I/O AD0-AD7 Port 4 (P4): • 8-bit I/O port. • Inputs and outputs can be specified bit by bit. • The use of pull-up resistors can be simultaneously specified by software for all pins in input mode. • Can drive LED. |
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