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OVERVIEW

7733 Group User’s Manual

1-7

1.3 Pin description

Functions

[Single-chip Mode]

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

P0. P42 can also be programmed as the clock

φ1 output

pin. (Refer to chapter “14. CLOCK GENERATING

CIRCUIT.”)

[Memory Expansion Mode]

_____

____

P40 functions as pin HOLD, and P41 as pin RDY.

_____

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.”

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

as port P0. P42 can also be programmed as the clock

φ1 output pin. (Refer to chapter “14. CLOCK

GENERATING CIRCUIT.”)

[Microprocessor Mode]

_____

____

P40 functions as pin HOLD, P41 as pin RDY, and P42

as the clock

φ1 output pin. (Refer to “[Memory

Expansion Mode].”) P43–P47 function as I/O ports

with the same function as port P0.

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

P0 and can be programmed as I/O pins for timers A0–

_____

______

A3 and input pins (KI0–KI3) for the key input interrupt.

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

P0 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

P0 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. When inputting an external clock, input

the clock from pin XCIN. P72–P75 also function as

UART2’s I/O pins.

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

P0 and can be programmed as serial I/O’s I/O pins.

Input/Output

I/O

Input

I/O

Input

Output

I/O

P40–P47

_____

HOLD

____

RDY

P42–P47

_____

HOLD

____

RDY

φ1,

P43–P47

P50–P57

P60–P67

P70–P77

P80–P87

Name

I/O port P4

I/O port P5

I/O port P6

I/O port P7

I/O port P8

Table 1.3.3 Pin description (3)

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