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OVERVIEW

1-6

7733 Group User’s Manual

1.3 Pin description

Table 1.3.2 Pin description (2)

Input/Output

I/O

Output

I/O

Output

Functions

[Single-chip Mode]

P0 is an 8-bit CMOS I/O port and has an I/O direction

[Memory Expansion Mode] [Microprocessor Mode]

Address’s low-order 8 bits (A0–A7) are output.

[Single-chip Mode]

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

P0.

[Memory Expansion Mode] [Microprocessor Mode]

q When the external data bus width = 8 bits

(Pin BYTE is at “H” level)

Address’s middle-order 8 bits (A8–A15) are output.

q When the external data bus width = 16 bits

(Pin BYTE is at “L” level)

Input/Output of data (D8–D15) and output of address’s

middle-order 8 bits (A8–A15) are performed with the

time sharing method.

[Single-chip Mode]

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

P0.

[Memory Expansion Mode] [Microprocessor Mode]

Input/Output of data (D0–D7) and output of address’s

high-order 8 bits (A16–A23) are performed with the time

sharing method.

[Single-chip Mode]

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

[Memory Expansion Mode] [Microprocessor Mode]

____

These pins respectively output signals R/W, BHE, ALE,

_____

and HLDA.

q Signal R/W

This signal indicates the data bus state.

When this signal level is “H,” a data bus is in the

read state. When this signal level is “L,” a data bus

is in the write state.

____

q Signal BHE

This signal’s level is “L” when the microcomputer

accesses an odd address.

q Signal ALE

This signal is used to separate the multiplexed signal which

consists of an address and data to the address and the data.

_____

q Signal HLDA

This signal informs the external whether this

microcomputer enters the Hold state or not.

_____

In Hold state, pin HLDA outputs “L” level.

Name

I/O port P0

I/O port P1

I/O port P2

I/O port P3

P00–P07

A0–A7

P10–P17

A8/D8–

A15/D15

P20–P27

A16/D0–

A23/D7

P30–P33

R/W,

____

BHE

ALE,

_____

HLDA

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