M37544 RENESAS [Renesas Technology Corp], M37544 Datasheet - Page 38

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

Rev.1.04
REJ03B0012-0104Z
7544 Group
Fig. 46 Block diagram of internal clock generating circuit (for ceramic/quartz-crystal resonator)
Fig. 47 Block diagram of internal clock generating circuit (for RC oscillation)
Interrupt disable flag l
X
Interrupt disable flag l
2004.06.08
OUT
Interrupt request
Interrupt request
Q
Delay
Q
On-chip oscillator mode
On-chip oscillator
S
R
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S
R
X
IN
On-chip oscillator
Reset
Reset
STP instruction
Rf
X
STP instruction
RING
IN
X
On-chip
oscillator
mode
RING
OUT
Clock division ratio selection bit
Middle-, high-, low-speed mode
Clock division ratio selection bit
Middle-, high-, low-speed mode
1/8
1/8
1/2
Double-speed mode
On-chip oscillator mode
1/2
Double-speed mode
On-chip oscillator mode
High-speed mode
instruction
High-speed mode
instruction
1/4
WIT
1/4
WIT
S
R
1/2
S
R
Clock division
ratio selection bit
Middle-speed mode
1/2
Clock division
ratio selection bit
Middle-speed mode
Q
Q
Q
Prescaler 1
Q
Prescaler 1
S
R
R
S
STP instruction
STP instruction
Timing
(Internal clock)
Timing
(Internal clock)
Timer 1
Timer 1
RESET
RESET