NEC PD754244 Manuel D’Utilisation

CHAPTER 6 PERIPHERAL HARDWARE FUNCTION

User’s Manual U10676EJ3V0UM

6.1.1 Types, features, and configurations of digital I/O ports

Table 6-1 shows the types of digital I/O ports.

Figures 6-2 to 6-9 show the configuration of each port.

Table 6-1. Types and Features of Digital Ports

Port

Function

Operation and Features

Remarks

PORT3

4-bit I/O

Can be set to input or output mode in 1-bit units.

Also used for PTO0 to PTO2

pins.

PORT6

Also used for AVREF, INT0,

PTH00, and PTH01 pins.

PORT7

4-bit input

4-bit input only port

Also used for KR4 to KR7 pins.

On-chip pull-up resistor can be specified by mask option

in 1-bits units.

PORT8

1-bit I/O

Can be set to input or output mode in 1-bit units.

–

P61 is shared with an external vector interrupt input pin and a noise eliminator is selectable (for details, refer to

7.3 Hardware Controlling Interrupt Function).

When the RESET signal is asserted, the output latches of ports 3, 6, and 8 are cleared to 0, the output buffers

are turned off, and the ports are set to the input mode.