7702 datasheet(21/217 Pages) RENESAS

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DESCRIPTION

7702/7703 Group User’s Manual

1–7

Table 1.3.2 Pin description (2)

1.3 Pin description

Functions

[Single-chip mode]

Port P0 is an 8-bit CMOS I/O port. This port has an

I/O direction register and each pin can be programmed

for input or output.

[Memory expansion mode] [Microprocessor mode]

Low-order 8 bits (A0–A7) of the address are output.

[Single-chip mode]

Port P1 is an 8-bit I/O port with the same function as

P0.

[Memory expansion mode] [Microprocessor mode]

qExternal bus width = 8 bits (When the BYTE pin is

“H” level)

Middle-order 8 bits (A8–A15) of the address are output.

qExternal bus width = 16 bits (When the BYTE pin is

“L” level)

Data (D8 to D15) input/output and output of the middle-

order 8 bits (A8–A15) of the address are performed

with the time sharing system.

[Single-chip mode]

Port P2 is an 8-bit I/O port with the same function as P0.

[Memory expansion mode] [Microprocessor mode]

Data (D0 to D7) input/output and output of the high-

order 8 bits (A16–A23) of the address are performed

with the time sharing system.

[Single-chip mode]

Port P3 is a 4-bit I/O port with the same function as P0.

[Memory expansion mode] [Microprocessor mode]

__ ____

_____

P30–P33 respectively output R/W, BHE, ALE, and HLDA

signals.

qR/W

The Read/Write signal indicates the data bus state.

The state is read while this signal is “H” level, and

write while this signal is “L” level.

____

qBHE

“L” level is output when an odd-numbered address is

accessed.

qALE

This is used to obtain only the address from address

and data multiplex signals.

_____

qHLDA

This is the signal to externally indicate the state when

the microcomputer is in Hold state.

“L” level is output during Hold state.

Input/Output

I/O

Output

I/O

Output

P00–P07

A0–A7

P10–P17

A8/D8–

A15/D15

P20–P27

A16/D0–

A23/D7

P30–P33

R/W,

____

BHE,

ALE,

_____

HLDA

_____

U : The 7703 Group does not have the P33/HLDA pin.

Name

I/O port P0

I/O port P1

I/O port P2

I/O port P3

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