7477 datasheet(199/354 Pages) RENESAS

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7470/7471/7477/7478 GROUP USER’S MANUAL

1-182

HARDWARE

1.19 Built-in PROM version

Input/

Output

Input

Output

Input/

output

Input/

output

Name

Power source

Analog power

source

Reference

voltage input

Mode input

Reset input

Clock input

Clock output

I/O port P0

Data I/O D0–D7

Functions

• Apply the following voltage to the VCC pin:

2.7 V to 4.5 V (at f(XIN) = (2.2 VCC–2) MHz) or

4.5 V to 5.5 V (at f(XIN) = 8 MHz).

• Apply 0 V to the VSS pin.

• Ground level input pin for the A-D converter.

• Apply the same voltage as the VSS pin to the

AVSS pin.

Note: This pin is dedicated to 56P6N-A package

products among the 7471/7478 group.

• Reference voltage input pin for the A-D con-

verter.

• When using the A-D converter, apply 0.5 VCC

(

Q2) to VCC [V].

• When not using the A-D converter, connect to

VCC.

•

__________

VREF works as CE input.

• Reset input pin

• The microcomputer is put into a reset state by

_________________________

keeping the RESET pin at “L” for 2

ms or more,

and the reset state is released by returning the

______________________

RESET

pin to “H.”

• Connect to the VSS pin.

• An input pin and an output pin for the main

clock generating circuit.

• Connect a ceramic resonator or a quartz-crys-

tal oscillator between pins XIN and XOUT.

• A feedback resistor is incorporated between the

XIN and the XOUT pins.

• To use an external clock input, connect the

clock oscillation source to the XIN pin and leave

the XOUT pin open.

• Port P0 is an 8-bit I/O port.

• The output structure is CMOS output.

• In input mode, a pull-up transistor is connect-

able in units of one bit.

• In input mode, a key-on wake up function is

provided.

• Port P0 works as data I/O (D0 – D7)

Mode

Ordinary

/EPROM

Ordinary

/EPROM

Ordinary

EPROM

Ordinary

EPROM

Ordinary

/EPROM

Ordinary

/EPROM

Ordinary

EPROM

1.19.2 Pin description

Table 1.19.3 to Table 1.19.5 show the description of pin functions in the ordinary mode and the EPROM

mode.

Table 1.19.3 Pin description (1)

VCC, VSS

AVSS

VREF

_________________________

RESET

XIN

XOUT

P00–P07

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