LC66558B View Datasheet(PDF) - SANYO -> Panasonic

Part Name

Description

Manufacturer

LC66558B

Four-Bit Single-Chip Microcontrollers with 6 k and 8 k Bytes of On-Chip ROM

SANYO -> Panasonic 

LC66556B, 66558B

Continued from preceding page.

Pin

PE0/TRA

PE1/TRB

OSC1

OSC2

RES

TEST

VDD

VSS

I/O

Function

Dedicated input port

I

• Can be switched under software

control to function as a three-

value input port.

System clock oscillator connections

I When an external clock is used,

O leave OSC2 open and input the

signal to OSC1.

System reset input

I

• The CPU is initialized (reset) if a

low level is input to RES when

P33/HOLD is at the high level.

CPU testing

I This pin must be connected to

VSS during normal operation.

Power supply connections

Note: Pull-up MOS output: An output with a pull-up MOS transistor

CMOS output:

A complementary output

OD output:

An open drain output

Output drive type

Option

Value on reset

Normal input

• Selection of either a

ceramic oscillator or

external clock input

User Option Types

1. Port 0, 1 and 8 reset time output level option

The output levels of I/O ports 0, 1 and 8 at reset can be selected from the following two options in 4-bit units.

Option

High level output at reset time

Low level output at reset time

Conditions and notes

Ports 0, 1 and/or 8 in 4-bit sets

Ports 0, 1 and/or 8 in 4-bit sets

2. Oscillator circuit option

Option

Circuit

Conditions and notes

External clock

• This input is a Schmitt specification input.

Ceramic oscillator

Note: There is no RC oscillator option.

3. Watchdog timer option

The presence or absence of a program runaway detection function (watchdog timer) can be selected as an option.

No. 5003-6/22

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