7702 datasheet(20/217 Pages) RENESAS

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DESCRIPTION

7702/7703 Group User’s Manual

1–6

1.3 Pin description

Tables 1.3.1 to 1.3.3 list the pin description. However, the pin description in the EPROM mode of the built-

in PROM version is described to section “19.2 EPROM mode.”

7703 Group

The 7703 Group does not have part of pins. Refer to “Chapter 20. 7703 GROUP.”

Table 1.3.1 Pin description (1)

1.3 Pin description

Functions

Supply 5 V ±10 %

V to Vcc pin and 0 V to Vss pin.

This pin controls the processor mode.

[Single-chip mode] [Memory expansion mode]

Connect to Vss pin.

[Microprocessor mode]

Connect to Vcc pin.

The microcomputer is reset when supplying “L” level

to this pin.

These are I/O pins of the internal clock generating

circuit. Connect a ceramic resonator or quartz-crystal

oscillator between pins XIN and XOUT. When using an

external clock, the clock source should be input to XIN

pin and XOUT pin should be left open.

This pin outputs E signal.

Data/instruction code read or data write is performed

when output from this pin is “L” level.

[Single-chip mode]

Connect to Vss.

[Memory expansion mode] [Microprocessor mode]

Input level to this pin determines whether the external

data bus has a 16-bit width or 8-bit width. The width

is 16 bits when the level is “L”, and 8 bits when the

level is “H”.

The power supply pin for the A-D converter. Externally

connect AVcc to Vcc pin.

The power supply pin for the A-D converter. Externally

connect AVss to Vss pin.

This is a reference voltage input pin for the A-D converter.

Vcc, Vss

CNVss

______

RESET

XIN

XOUT

BYTE

AVcc

AVss

VREF

Input/Output

Input

Output

Input

V : In the low voltage version, supply 2.7–5.5V to Vcc.

Name

Power supply

CNVss

Reset input

Clock input

Clock output

Enable output

Bus width selection

input

Analog supply

Reference voltage input

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