UPD75402A Datasheet, PDF (17/48 Pages) NEC – 4 BIT SINGLE-CHIP MICROCOMPUTER

µPD75402A(A)
5.4 BASIC INTERVAL TIMER
The basic interval timer provides the following functions:
• Interval timer operation that generates a reference time interrupt
• Can be used as a watchdog timer for detecting program crashes
• Reading the count value
Fig. 5-3 Configuration of the Basic Interval Timer
From the
clock
generator
fXX /2⁵
fXX /2⁹
MPX
Clear
Clear
Basic interval timer
(8-bit frequency divider)
Set ^BT
interrupt
request flag Vectored
interrupt
request
BT
IRQBT _signal
BTM3 BTM2
1
4
1 BTM
8
Internal bus
17