7733 datasheet(776/940 Pages) RENESAS

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EXTERNAL ROM VERSION

7735 Group User’s Manual

20–6

20.3 Pin description

Table 20.3.2 Pin description (2)

Input/Output

I/O

Output

Input

Output

I/O

Functions

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

low-order 8 bits (A0–A7) are performed with the time

sharing system.

____

These pins respectively output signals WEL, WEH, ALE,

_____

and HLDA.

____

q Signals WEL, WEH

____

Signal WEL is the write enable low signal.

____

Signal WEH is the write enable high signal.

These signals’ levels are “L” in the data write

period of the write cycle. The operations of these

signals depend on the level of pin BYTE. (Refer

to Table 12.1.1.)

q Signal ALE

This signal is used to separate the multiplexed signal which

consists of an address and data to the address and 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.

_____

The microcomputer is in Hold state while pin HOLD’s

____

input level is “L” and is in Ready state while pin RDY’s

input level is “L.” The clock

φ1 output can be stopped

by software. (Refer to chapter “14. CLOCK

GENERATING CIRCUIT.”)

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

as port P5.

P5 is a CMOS 8-bit I/O port and has an I/O direction

It can be programmed as I/O pins for timers A0–A3,

___ ___

input pins (KI0–KI3) for the key input interrupt and output

pins (RTP00–RTP13) for the pulse output.

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

P5 and can be programmed as I/O pins for timer A4,

external interrupt input pins, and input pins for timers

B0–B2. P67 also functions as an output pin for the sub

clock (

φSUB).

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

P5 and can be programmed as analog input pins for

the A-D converter. P76 and P77 can be programmed

as I/O pins (XCOUT, XCIN) for the sub-clock (32 kHz)

oscillation circuit. When using P76 and P77 as pins XCOUT

and XCIN, connect a quartz-crystal oscillator between

them. P72–P75 also function as UART2’s I/O pins.

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

P5 and can be programmed as serial I/O’s I/O pins.

Name

Address (low-order)

output/Data (low-order)

I/O

Write enable low output,

Write enable high output,

Address latch enable output,

Hold acknowledge output

Hold request input,

Ready input,

Clock output,

I/O port P4

I/O port P5

I/O port P6

I/O port P7

I/O port P8

A0/D0 (P20)

–A7/D7

(P27)

____

WEL

(P30),

____

WEH

(P31),

ALE (P32),

_____

HLDA

(P33)

_____

HOLD

____

RDY

φ1(P42),

P43–P47

P50–P57

P60–P67

P70–P77

P80–P87

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