SM565 View Datasheet(PDF) - Sharp Electronics

Part Name

Description

Manufacturer

SM565

4-Bit Single-Chip Microcomputer

Sharp Electronics 

4-Bit Single-Chip Microcomputer

SM565

PIN FUNCTIONS

GND, VDD, VDSP (Power Supply Inputs)

Both GND pins 40 and 90 should be grounded. The

VDD pin is the positive power supply with respect to

GND. The VDSP is the positive power supply for a LCD

driver with respect to GND.

TEST (Test Input)

The TEST pin should be left open or connected to

GND with a pull-down resistor.

RESET (Input)

The RESET pin accepts an active LOW system reset

which initializes the internal logic of the device. Normally

a capacitor of about 0.1 µF is connected between this

pin and GND to provide a power on reset function.

OSCIN, OSCOUT (Crystal Oscillator Pins)

The OSCIN and OSCOUT pins connect with an exter-

nal crystal oscillator and these pins and the GND con-

nect with a capacitor, which constitute an oscillator

circuit.

The output of the oscillator is coupled to a clock

divider for real-time clock operation.

CK1, CK2 (System Clock Oscillator Pins)

The CK1 and CK2 pins provide a system clock

oscillator.

H1 to H4 (Common Signal Outputs)

The H1 to H4 pins are used to drive the common sig-

nal of a LCD.

S0 to S63 (Segment Outputs)

The S0 to S63 pins drive LCD segments. Pins S0

through S15 may also be used as I/O ports when spec-

ified with the mode register RC.

P00 to P03 (Inputs)

The P0 pins are normally used to accept key input

data. A falling edge at these pins resets the IFB flag.

P10 to P13 (Input/Output)

The P1 pins are I/O pins connected to the positive

supply with pull-up resistors. They may be switched

between input and output modes through an instruc-

tion.

P20 to P23 (Input/Output)

The P20 to P23 pins are bit-independent I/O ports

which can be independently set to input or output mode

with the mode register RF.

When the P23 is used for an output pin, it serves

exclusively as a sound output pin, which can output a

sound signal with any frequency set up by the timer

counter.

Pins P20 and P21 output the OD and R/W signals

with the mode register RC.

P30 to P32 (Input/Output)

The P30 to P32 pins are I/O pins which are con-

nected to the positive supply with pull-up resistors.

These pins can be set to I/O mode for use in a serial

interface with the mode register RE.

ΦOUT (Carrier Output Pin for

Remote Control)

A carrier signal output pin for remote control. It is

used to control carrier signal output by setting the bits

in the bit 3 of R7 register.

Microcomputer Data Sheet

7

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