D78F9189CT 查看數據表（PDF） - NEC => Renesas Technology

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D78F9189CT

UPD78F9189CT, D78F9189CT / 8-Bit Single-chip Microcontroller

NEC => Renesas Technology 

CHAPTER 2 PIN FUNCTIONS

2.2 Description of Pin Functions

2.2.1 P00 to P04 (Port 0)

These pins constitute a 5bit I/O port and can be set to input or output port mode in 1-bit units by using port mode

register 0 (PM0). When these pins are used as an input port, an on-chip pull-up resistor can be used by setting pull-

up resistor option register 0 (PU0).

2.2.2 P10, P11 (Port 1)

These pins constitute a 2-bit I/O port and can be set to input or output port mode in 1-bit units by using port mode

register 1 (PM1). When these pins are used as an input port, an on-chip pull-up resistor can be used by setting pull-

up resistor option register 0 (PU0).

2.2.3 P20 to P26 (Port 2)

These pins constitute a 7-bit I/O port. In addition, these pins provide a function to perform input/output to/from

the timer and to input/output the data and clock of the serial interface.

Port 2 can be set to the following operation modes in 1-bit units.

(1) Port mode

In port mode, P20 to P26 function as a 7-bit I/O port. Port 2 can be set to input or output mode in 1-bit units

by using port mode register 2 (PM2). For P20 to P22, P25, and P26, whether to use on-chip pull-up

resistors can be specified in 1-bit units by using pull-up resistor option register B2 (PUB2), regardless of the

setting of port mode register 2 (PM2). P23 and P24 are N-ch open-drain I/O ports.

(2) Control mode

In this mode, P20 to P26 function as the timer input/output, the data input/output and the clock input/output

of the serial interface.

(a) TI80

This is the external clock input pin for 8-bit timer/event counter 80.

(b) TO80

This is the timer output pin of 8-bit timer/event counter 80.

(c) SI20, SO20

These are the serial data I/O pins of the serial interface.

(d) SCK20

These are the serial clock I/O pins of the serial interface.

(e) SS20

This is the chip select input pin of the serial interface.

(f) RxD20, TxD20

These are the serial data I/O pins of the asynchronous serial interface.

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User’s Manual 2nd edition

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