M37544 RENESAS [Renesas Technology Corp], M37544 Datasheet - Page 39

• Manufacturer Part Number: M37544
• Description: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
• Manufacturer: RENESAS [Renesas Technology Corp]

Rev.1.04
REJ03B0012-0104Z
7544 Group
Fig. 48 State transition
Operation clock source:
f(X
f(X
On-chip oscillator stop
IN
IN
) (Note 1)
) oscillation enabled
State 1
2004.06.08
Oscillation stop detection circuit valid
Operation clock source:
f(X
f(X
On-chip oscillator enabled
CPUM
CPUM
Interrupt
STP
instruction
page 39 of 66
IN
IN
) (Note 1)
) oscillation enabled
3
MISRG
3
¨1
2
0
State 2’
2
Operation clock source:
f(X
f(X
On-chip oscillator enabled
1
¨1
2
IN
IN
Interrupt
) (Note 1)
) oscillation enabled
Stop mode
State 2
WIT
instruction
MISRG
CPUM
CPUM
1
(Note 2)
76
0
76
2
¨10
00
01
11
2
2
2
2
Operation clock source:
On-chip oscillator (Note 3)
f(X
On-chip oscillator enabled
CPUM
IN
CPUM
MISRG
) oscillation enabled
76
(Note 2)
¨10
76
¨00
State 3’
2
01
11
1
¨1
Reset released
2
2
2
2
Operation clock source:
On-chip oscillator (Note 3)
f(X
On-chip oscillator enabled
IN
Wait mode
) oscillation enabled
MISRG
State 3
Reset state
1
¨0
2
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 = on-chip oscillator, the middle-
(4) When the state transition state 2
Interrupt
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
oscillation)
f(X
f(X
f(X
Double-speed mode at on-chip oscillator: NOP
High-speed mode at on-chip oscillator: NOP
Middle-speed mode at on-chip oscillator: NOP
4
4
IN
IN
IN
¨0
)/2 (high-speed mode)
)/8 (middle-speed mode)
) (double-speed mode, only at a ceramic/quartz-crystal
2
1
2
WIT
instruction
Operation clock source:
On-chip oscillator (Note 3)
f(X
On-chip oscillator enabled
1
IN
10
2
) oscillation stop
(State 3
2
(State 2
State 4
state 4)
state 3)
IN
), the following can be
IN
state 3
oscillation.
state 4
1
0
3