Specifications
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
7560 Group
13
[CPU Mode Register (CPUM)] 003B16
The CPU mode register contains the stack page selection bit and
the system clock control bits, etc.
The CPU mode register is allocated at address 003B16.
Fig. 10 Structure of CPU mode register
P
rocessor mo
d
e
bi
ts
b1 b0
0 0 : Single-chip mode
0 1 :
1 0 :
1 1 :
Stack page selection bit
0 : 0 page
1 : 1 page
Not used (“1” at reading)
(Write “1” to this bit at writing)
X
C
switch bit
0 : Oscillation stop
1 : X
CIN–XCOUT
oscillating function
Main clock (X
IN
–X
OUT)
stop bit
0 : Oscillating
1 : Stopped
Main clock division ratio selection bit
0 : f(X
IN)/2 (high-speed mode)
1 : f(X
IN)/8 (middle-speed mode)
System clock selection bit
0 : X
IN–XOUT selected (middle-/high-speed mode)
1 : X
CIN–XCOUT selected (low-speed mode)
D
o not se
l
ect
C
P
U
m
o
d
e
r
e
g
i
s
t
e
r
(CPUM (CM) : address 003B
16
)
b
7
b
0
1