M37544G Mitsubishi Electric, M37544G Datasheet - Page 37

• Manufacturer Part Number: M37544G
• Description: Single-Chip 8-Bit CMOS Microcomputer
• Manufacturer: Mitsubishi Electric

Fig. 46 State transition
O p e r a t i o n c l o c k s o u r c e :
f (X
f (X
R i n g o s c i l l a t o r s t o p
I N
I N
) ( N o t e 1 )
) o s c i l l a t i o n e n a b l e d
S t a t e 1
O s c i l l a t i o n s t o p d e t e c t i o n c i r c u i t v a l i d
C P U M
C P U M
O p e r a t i o n c l o c k s o u r c e :
f (X
f (X
R i n g o s c i l l a t o r e n a b l e d
I n t e r r u p t
STP
instruction
I N
I N
) ( N o t e 1 )
) o s c i l l a t i o n e n a b l e d
3
3
M I S R G
0
1
S t a t e 2 ’
2
2
1
O p e r a t i o n c l o c k s o u r c e :
f (X
f (X
R i n g o s c i l l a t o r e n a b l e d
1
I n t e r r u p t
I N
I N
2
) ( N o t e 1 )
) o s c i l l a t i o n e n a b l e d
S t a t e 2
S t o p m o d e
M I S R G
W I T
i n s t r u c t i o n
CPUM
CPUM
1
0
76
(Note 2)
76
2
10
00
01
11
2
2
2
2
C P U M
CPUM
O p e r a t i o n c l o c k s o u r c e :
R i n g o s c i l l a t o r ( N o t e 3 )
f ( X
R i n g o s c i l l a t o r e n a l b e d
(Note 2)
MISRG
I N
76
7 6
) o s c i l l a t i o n e n a b l e d
00
01
11
1 0
S t a t e 3 ’
2
2
2
2
1
Reset released
1
Operation clock source:
Ring oscillator (Note 3)
f(X
Ring oscillator enalbed
2
IN
W a i t m o d e
) oscillation enabled
MISRG
State 3
Reset state
1
0
2
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Notes on switch of clock
(1) In operation clock source = f(X
(2) Execute the state transition state 3 to state 2 or
(3) In operation clock source = ring oscillator, the middle-
(4) When the state transition state 2
I n t e r r u p t
CPUM
CPUM
selected for the CPU clock division ratio.
state 3’ to state 2’ after stabilizing X
speed mode is selected for the CPU clock division ratio.
is performed, execute the NOP instruction as shown below
according to the division ratio of CPU clock.
• CPUM76
• NOP instruction
• CPUM4
f(X
f(X
f(X
Double-speed mode at ring oscillator: NOP
High-speed mode at ring oscillator: NOP
Middle-speed mode at ring oscillator: NOP
4
4
MITSUBISHI MICROCOMPUTERS
IN
IN
IN
)/2 (high-speed mode)
)/8 (middle-speed mode)
) (double-speed mode, only at a ceramic oscillation)
1
0
2
2
WIT
instruction
Operation clock source:
Ring oscillator (Note 3)
f(X
Ring oscillator enalbed
1
10
2
IN
(State 3
) oscillation stop
2
(State 2
State 4
state 4)
state 3)
7544 Group
IN
), the following can be
IN
state 3
oscillation.
1
state 4
0
3
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