OKI MSM6422-xxGS-K, MSM6422-xxRS Datasheet

E2E0016-38-93

¡ Semiconductor

This version: Sep. 1998

Previous version: Mar. 1996

MSM6422¡ Semiconductor

MSM6422

High speed and Simple 4-Bit Microcontroller

GENERAL DESCRIPTION

The MSM6422 is a low-power, single-chip device implemented in complementary metal-oxide
semiconductor technology.
The MSM6422 can be used in place of logic ICs configured around a main CPU, or for small-scale
systems such as home electronic equipment.

FEATURES

• ROM : 2048 words ¥ 8 bits

• RAM : 64 words ¥ 4 bits

• I/O port
Input-output port : 4 ports ¥ 4 bits (pseudo bidirectional configuration)

1 port ¥ 2 bits (pseudo bidirectional configuration)

Input port : 1 port ¥ 1 bit (combined use with an interrupt input)

• Instructions : 63

• Two interrupt sources (1 internal, 1 external)

• Power down features

• Minimum instruction execution time : 952 ns @ 4.2 MHz clock

• Crystal and ceramic oscillation

• Single 5 V power supply

• Package options:
24-pin plastic DIP (DIP24-P-600-2.54) : (Product name : MSM6422-¥¥RS)
24-pin plastic SOP (SOP24-P-430-1.27-K) : (Product name : MSM6422-¥¥GS-K)

¥¥ indicates a code number.

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BLOCK DIAGRAM

MSM6422¡ Semiconductor

RAM

64 ¥ 4 bits

DEC

3 21 010

ACC

C

ALU

HRLRSP

3210 3210 3210

INST

DEC

ROM

2048 ¥ 8 bits

DEC

PC

INT.C

P0P1P3P4P5

P2

12-bitTBC

0/INT

GND V

DD

Timing

&

Control

OSC1 OSC0

RESET

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PIN CONFIGURATION (TOP VIEW)

MSM6422¡ Semiconductor

P2.0/INT

P0.0

P0.1

P0.2

P0.3

P1.0

P1.1

P1.2

P1.3

OSC
OSC

GND

1

2

3

4

5

6

7

8

9

10

1

11

0

12

24

23

22

21

20

19

18

17

16

15
14

13

V

DD

P5.1

P5.0

P4.3

P4.2

P4.1

P4.0

P3.3

P3.2

P3.1
P3.0

RESET

P2.0/INT

P0.0

P0.1

P0.2

P0.3

P1.0

P1.1

P1.2

P1.3

OSC
OSC

GND

24-Pin Plastic DIP

1

2

3

4

5

6

7

8

9

10

1

11

0

12

24

23

22

21

20

19

18

17

16

15
14

13

V

DD

P5.1

P5.0

P4.3

P4.2

P4.1

P4.0

P3.3

P3.2

P3.1
P3.0

RESET

24-Pin Plastic SOP

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