M37544G Mitsubishi Electric, M37544G Datasheet - Page 36

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

Fig. 44 Block diagram of internal clock generating circuit (for ceramic resonator)
Fig. 45 Block diagram of internal clock generating circuit (for RC oscillation)
36
Interrupt disable flag l
X
Interrupt disable flag l
OUT
Interrupt request
Interrupt request
Q
Ring oscillator
Delay
Q
S
R
Ring oscillator mode
X
S
R
IN
Reset
Ring oscillator
STP instruction
Rf
Reset
RING
STP instruction
X
IN
X
OUT
Ring
oscillator
mode
RING
Main clock division ratio selection bit
Middle-, high-, low-speed mode
Main clock division ratio selection bit
Middle-, high-, low-speed mode
1/8
1/8
1/2
Double-speed mode
Ring oscillator mode
1/2
High-speed mode
instruction
Double-speed mode
Ring oscillator mode
High-speed mode
instruction
1/4
WIT
1/4
WIT
S
R
1/2
Main clock division
ratio selection bit
Middle-speed mode
S
R
Q
1/2
Main clock division
ratio selection bit
Middle-speed mode
Q
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Q
Prescaler 1
Prescaler 1
Q
S
R
MITSUBISHI MICROCOMPUTERS
S
R
STP instruction
STP instruction
Timing
(Internal clock)
Timing
(Internal clock)
Timer 1
Timer 1
7544 Group
RESET
RESET