MSM64162 datasheet(13/39 Pages) OKI

Part #	MSM64162

Description	4-Bit Microcontroller with Built-in RC Oscillation Type A/D Converter and LCD Driver

PDF	39 Pages

Scroll/Zoom	100%

Manufacturer	OKI [OKI electronic componets]

Direct Link	http://www.oki.com

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¡ Semiconductor

MSM64162

Data Memory

The data memory area consists of 8 banks and each bank has 256 nibbles (256 ¥ 4 bits).

The data RAM is assigned to BANK 7 and peripheral ports are assigned to BANK 0.

7FFH

BANK 7

Data RAM area

4 bits

780H

0FFH

080H

07FH

000H

Unused area

BANK 0

Data/Stack area (128 nibbles)

Contents of 000H to 07FH

SFR area

07FH

000H

Inaccessible area

Unused area

77FH

700H

100H

Data Memory Map

The data RAM area (128 nibbles) is shared by the stack area. The stack is a memory starting from

address 7FFH toward the low-order addresses where 4 nibbles are used by Subroutine Call

Instruction and 8 nibbles are used by an interrupt.

The addresses 080H to 0FFH of BANK 0 and the addresses 700H to 77FH of BANK 7 are not

assigned as the data memory, so access to these addresses has no effect. Moreover, it is

impossible to access BANK 1 to BANK 6.

MSM64162 Datasheet(PDF) 13 Page - OKI electronic componets