M37221 Mitsubishi, M37221 Datasheet - Page 6

• Manufacturer Part Number: M37221
• Description: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER
• Manufacturer: Mitsubishi

Fig. 1. Structure of CPU mode register
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.
6
Note : Please beware of this bit when programming because it
7
1 1
is set to “1” after the reset release.
1
1 1
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER
0
0
0
CPU mode register
(CPUM : address 00FB
Fix these bits to “0.”
Stack page selection bit (Note)
Fix these bits to “1.”
0 : Zero page
1 : 1 page
M37221EF-XXXSP,M37221EFSP
CPU Mode Register
The CPU mode register contains the stack page selection bit. The
CPU mode register is allocated at address 00FB
16
with ON-SCREEN DISPLAY CONTROLLER
)
MITSUBISHI MICROCOMPUTERS
16
.