M37221EFSP データシートの表示（PDF） - Mitsumi

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M37221EFSP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER

Mitsumi 

MITSUBISHI MICROCOMPUTERS

M37221EF-XXXSP,M37221EFSP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER

with ON-SCREEN DISPLAY CONTROLLER

FUNCTIONAL DESCRIPTION

Central Processing Unit (CPU)

The M37221EF-XXXSP uses the standard 740 family instruction set.

Refer to the table of 740 family addressing modes and machine in-

structions or the SERIES 740 <Software> User’s Manual for details

on the instruction set.

Machine-resident 740 family instructions are as follows:

The FST, SLW instruction cannot be used.

The MUL, DIV, WIT and STP instruction can be used.

CPU Mode Register

The CPU mode register contains the stack page selection bit. The

CPU mode register is allocated at address 00FB16.

7

11 1 11

0

CPU mode register

0 0 (CPUM : address 00FB16)

Fix these bits to “0.”

Stack page selection bit (Note)

0 : Zero page

1 : 1 page

Fix these bits to “1.”

Note : Please beware of this bit when programming because it

is set to “1” after the reset release.

Fig. 1. Structure of CPU mode register

6

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