M38002M4 Datasheet, PDF (27/173 Pages) Mitsubishi Electric Semiconductor – 8-BIT SINGLE-CHIP MICROCOMPUTER

CPU mode register
The CPU mode register is allocated at address 003B16.
The CPU mode register contains the stack page selection bit.
b7
b0
CPU mode register
(CPUM : address 003B16)
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. 9 Structure of CPU mode register
HARDWARE
FUNCTIONAL DESCRIPTION
3800 GROUP USER’S MANUAL
1-13