M37221M6_03 Datasheet, PDF (7/62 Pages) Renesas Technology Corp – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER

MITSUBISHI MICROCOMPUTERS
M37221M6-XXXSP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER
with ON-SCREEN DISPLAY CONTROLLER
FUNCTIONAL DESCRIPTION
Central Processing Unit (CPU)
The M37221M6-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