100
MITSUBISHI MICROCOMPUTERS
M37207MF-XXXSP/FP, M37207M8-XXXSP
M37207EFSP/FP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER
and ON-SCREEN DISPLAY CONTROLLER
Structure of Register
The figure of each register structure describes its functions, contents
at reset, and attributes as follows:
Values immediately after reset release
Bit attributes
(Note 1)
(Note 2)
Bits
2: Bit attributes••••••The attributes of control register bits are classified into 3 types : read-only, write-only
and read and write. In the figure, these attributes are represented as follows :
: Bit in which nothing is assigned
Notes 1: Values immediately after reset release
0••••••“0” after reset release
1••••••“1” after reset release
?••••••Indeterminate after reset release
••••••Read enabled
••••••Read disabled
R••••••Read
••••••Write enabled
••••••Write disabled
••••••“0” can be set by software, but “1”
cannot be set.
W••••••Write
✕
✽
b7b6 b5b4b3 b2b1b0
B
After reset
RW
CPU Mode Register
0, 1
2
3, 4
0
1
1
Name Functions
Processor mode bits
(CM0, CM1)
0 0: Single-chip mode
0 1:
1 0: Not available
1 1:
Fix these bits to “1.”
0
Stack page selection
bit (Note) (CM2)
1
b1 b0
0: 0 page
1: 1 page
100
5 Nothing is assigned. This bit is write disable bit.
When this bit is read out, the value is “0.”
6, 7 0
Clock switch bits
(CM6, CM7)
0 0: f(X
IN
) = 8 MHz
0 1: f(X
IN
) = 12 MHz
1 0: f(X
IN
) = 16 MHz
1 1: Do not set
b7 b6
CPU mode register (CPUM) (CM) [Address FB
16]
RW
RW
RW
RW
RW
[Example]
✕
