µPD75064, 75066, 75068, 75064(A), 75066(A), 75068(A)
5.4 Basic Interval Timer
The basic interval timer has these functions:
• Interval timer operation which generates a reference timer interrupt
• Watchdog timer application which detects a program runaway
• Selection of wait time for releasing the standby mode and counting the wait time
• Reading out the count value
Figure 5-3. Basic Interval Timer Configuration
From the clock
generator
fX/25
fX/27
fX/29
fX/212
MPX
Clear signal
Clear signal
Basic interval timer
(8-bit frequency divider circuit)
BT
Set
signal
BT interrupt
request flag
IRQBT
Vectored
interrupt
request
signal
3
BTM3 BTM2 BTM1 BTM0 BTM
SET1 Note
4
Note Instruction execution
8
Internal bus
Wait release
signal for standby
release
21