UPD753206 datasheet(21/80 Pages) NEC

21 / 80 page

µPD753204, 753206, 753208

6. PERIPHERAL HARDWARE FUNCTION

6.1 Digital I/O Port

There are three kinds of I/O ports.

•

CMOS input ports (Ports 0, 1)

: 6

•

CMOS input/output ports (Ports 2, 3, 6, 8, 9)

: 20

•

N-ch open-drain input/output ports (Port 5)

: 4

Total

Table 6-1. Types and Features of Digital Ports

Port

Function

Operation and features

Remarks

PORT0

4-bit input

The alternate function pins have an output function

Also used for the INT4, SCK,

with operation mode when using the serial interface

SO/SB0, and SI/SB1 pins.

function.

PORT1

1-bit input

2-bit input dedicated port

Also used for the INT0 and

TI0.

PORT2

4-bit I/O

Can be set to input mode or output mode in 4-bit

Also used for the PTO0 to

units.

PTO2, PCL, and BUZ pins.

PORT3

Can be set to input mode or output mode bit-wise.

Also used for the LCDCL

and SYNC pins.

PORT5

4-bit I/O (N-

Can be set to input mode or output mode in 4-bit

—

channel open-

units. On-chip pull-up resistor can be specified

drain, 13-V

by mask option bit-wise.

withstand)

PORT6

4-bit I/O

Can be set to input mode or output mode bit-wise.

Also used for the KR0 to

KR3 pins.

PORT8

Can be set to input mode

Ports 8 and 9 are paired

Also used for the S20 to

or output mode in 4-bit

and data can be input/

S23 pins.

units.

output in 8-bit units.

PORT9

Also used for the S16 to

S19 pins.

UPD753206 Datasheet(PDF) 21 Page - NEC

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