MITSUBISHI MICROCOMPUTERS
3802 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
FUNCTIONAL DESCRIPTION
Central Processing Unit (CPU)
The 3802 group uses the standard 740 family instruction set. Re-
fer to the table of 740 family addressing modes and machine in-
structions or the SERIES 740 <Software> User’s Manual for de-
tails on the instruction set.
Machine-resident 740 family instructions are as follows:
The FST and SLW instruction cannot be used.
The STP, WIT, MUL, and DIV instruction can be used.
CPU mode register
The CPU mode register is allocated at address 003B
16
.
The CPU mode register contains the stack page selection bit.
b7
b0
CPU mode register
(
CPUM : address
003B
16
)
Processor mode bits
b1 b0
0 0 : Single-chip mode
0 1 : Memory expansion mode
1 0 : Microprocessor mode
1 1 : Not available
Stack page selection bit
0 : 0 page
1 : 1 page
Not used (return “0” when read)
Fig. 1 Structure of CPU mode register
8
RENESAS [ RENESAS TECHNOLOGY CORP ]
