MSM63P238 Просмотр технического описания (PDF) - Oki Electric Industry

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MSM63P238

4-Bit Microcontroller with Built-in 16K Word PROM, POCSAG Decoder, and Melody Circuit

Oki Electric Industry 

¡ Semiconductor

MSM63P238

PIN DESCRIPTIONS

The basic functions of each pin of the MSM63P238 are described in Table 1.

A symbol with a slash (/) denotes a pin that has a secondary function.

Refer to Table 2 for secondary functions.

For type, "—" denotes a power supply pin, "I" an input pin, "O" an output pin, and "I/O" an input-

output pin.

Function

Symbol

VPP

VDD

VSS

VDDR

VDDI

Power

Supply

VDDL

VDD2

VDDH

Oscillation

CB1

CB2

XT0

XT1

XTM0

XTM1

OSC0

OSC1

XTSEL0

XTSEL1

TST1

Test

TST2

TST3

Reset

RESET

Table 1 Pin Descriptions (Basic Functions)

Pin

Type

Description

35

— Power supply (+12.5 V) for PROM writing

31

— Positive power supply

32

— Negative power supply

13

— Interface power supply for SIGIN, BS1, BS2

Positive power supply pin for external interface

36

—

(power supply for input, output, and I/O ports)

Positive power supply pin for internal logic (internally generated).

27

—

A capacitor (0.1 mF) should be connected between this pin and VSS.

26

— Positive power supply pin for low-speed clock (internally generated)

Voltage multiplier pin for power supply backup

28

— (internally generated).

A capacitor (1.0 mF) should be connected between this pin and VSS.

29

— Pins to connect a capacitor for voltage multiplier.

30

— A capacitor (1.0 mF) should be connected between CB1 and CB2.

14

I Clock oscillation pins for POCSAG decoder.

A 32.768 kHz, 38.4 kHz, or 76.8 kHz crystal and capacitor (CG)

15

O should be connected to these pins.

23

I Low-speed clock oscillation pins for CPU.

24

O A 32.768 kHz crystal and capacitor (CGM) should be connected

to these pins.

19

I High-speed clock oscillation pins.

A ceramic resonator and capacitors (CL0, CL1) or external

20

O oscillation resistor (ROS) should be connected to these pins.

Low-speed CPU clock select pins.

21

These pins are used to select a low-speed CPU clock.

I

Because these are high impedance inputs, be sure to tie these

22

pins to VDD or VSS.

16

Input pins for testing.

17

I Pull-down resistors are internally connected to these pins.

18

The user cannot use these pins.

Reset input pin.

Setting this pin to "H" level puts this device into a reset state.

34

I Then, setting this pin to "L" level starts executing an instruction

from address 0000H.

A pull-down resistor is internally connected to this pin.

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