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UPD75402ACT Datasheet(PDF) 17 Page - NEC

Part # UPD75402ACT
Description  4 BIT SINGLE-CHIP MICROCOMPUTER
PDF  48 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

UPD75402ACT Datasheet(HTML) 17 Page - NEC

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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 /2
5
fXX /2
9
MPX
BTM3
BTM2
1
1
BTM
48
Internal bus
Clear
Set
BT
Basic interval timer
(8-bit frequency divider)
BT
interrupt
request flag
IRQBT
Vectored
interrupt
request
signal
Clear



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