LC66E516 View Datasheet(PDF) - SANYO -> Panasonic

Part Name

Description

Manufacturer

LC66E516

4-bit Single Chip Microcontroller with EPROM

SANYO -> Panasonic 

LC66E516

Continued from preceding page.

pin name

OSC1

OSC2

RES

TEST/Vpp

VDD

Vss

Input/

output

Functional description

I Pins for connecting system clock oscillator

O externally. If external clock source mode is

to be employed, use the OSC1 pin only for

clock input. Leave the other pin open.

I

Input port pin for system reset request

signal

· To initialize the CPU, the RES (active

low) pin level must be L with the P33/

HOLD pin level = H.

I

Input port pin for CPU test signal

This pin should be connected with the

VSS pin when this device is in operation.

Power supply pin

Output driver circuit

output type

Option

· Ceramic resonator

oscillation. RC

oscillation or

external clock

source

During EPROM

mode operation

Remarks:

Pu MOS type output --- Pch MOS type transistor acts as a pull-up resistor when data is output.

CMOS type output --- Pch MOS type transistor does not act as a pull-up resistor when data is output.

Instead, it forms a complementary-symmetry MOS output circuit with an Nch MOS type

transistor.

OD output

--- Open drain output type

Note:

At the system reset, the pin output level of each of input/output and output port pins will be "H" except for such pins as

ports 0, 1 and 8. The output level of these exceptions can be specified by the user options. In addition to this system reset

operation, the port output type will be set to open drain at the system reset, which is irrespective of user option specifica-

tion. In this case, there is no exception.

User options

1. Option for specifying the output level of ports 0, 1 and 8 at the system reset

The output level of ports 0, 1 and 8 at the system reset can be selected from the following two optional levels by the

user option. In this case, it should be kept in mind that the output levels of all the four bits of each input/output port are

specified at the same time.

Option name

1. "H" output level

2. "L" output level

Condition

In 4-bit units

In 4-bit units

2. Option for selecting oscillation circuit

Option name

1. External clock source

Selectable oscillation circuit

· Schmitt trigger input

Condition

2. 2-pin (OSC1 and

OSC2) RC oscillation

circuit

3. Ceramic resonator

oscillation circuit

· Schmitt trigger input

No.2928–7/18

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