7751 datasheet(18/540 Pages) RENESAS

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DESCRIPTION

7751 Group User’s Manual

1–7

1.3 Pin description

Table 1.3.3 Pin description (3)

P40–P47

_____

HOLD,

____

RDY,

P42–P47

_____

HOLD,

____

RDY,

φ1,

P43–P47

P50–P57

P60–P67

P70–P77

P80–P87

Functions

[Single-chip mode]

Port P4 is an 8-bit I/O port with the same function as

P0. P42 can be programmed as the clock

φ1 output pin.

[Memory expansion mode]

_____

____

P40 functions as the HOLD input pin, P41 as the RDY

input pin. The microcomputer is in Hold state while “L”

_____

level is input to the HOLD pin.

The microcomputer is in Ready state while “L” level is

____

input to the RDY pin.

P42–P47 function as I/O ports with the same functions

as P0.

P42 can be programmed for the clock

φ1 output pin.

[Microprocessor mode]

_____

____

P40 functions as the HOLD input pin, P41 as the RDY

input pin. P42 always functions as the clock

φ1 output

pin.

P43–P47 function as I/O ports with the same functions

as P0.

Port P5 is an 8-bit I/O port with the same function as

P0. These pins can be programmed as I/O pins for

Timers A0–A3.

Port P6 is an 8-bit I/O port with the same function as

P0. These pins can be programmed as I/O pins for

Timer A4, input pins for external interrupt and input

pins for Timers B0–B2.

Port P7 is an 8-bit I/O port with the same function as

P0. These pins can be programmed as input pins for

A-D converter.

Port P8 is an 8-bit I/O port with the same function as

P0. These pins can be programmed as I/O pins for

serial I/O.

Name

I/O port P4

I/O port P5

I/O port P6

I/O port P7

I/O port P8

Input/Output

I/O

Input

I/O

Input

Output

I/O

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