UPD75238GJ NEC [NEC], UPD75238GJ Datasheet - Page 77

• Manufacturer Part Number: UPD75238GJ
• Description: 4 BIT SINGLE-CHIP MICROCOMPUTER
• Manufacturer: NEC [NEC]

4.8 EVENT COUNTER
(1) Configuration of the event counter
(2) Event counter functions
The event counter of the PD75238 has a noise eliminator. Fig. 4-36 shows the configuration of the counter.
Caution The TI0/P13 pin is an external event pulse input pin shared between timer/event counter #0
The event counter provides the following functions:
(a) Event counter operation
(b) Function of reading the state of counting
(c) Count pulse edge specification
(d) Noise elimination function
TI0/P13
TM1.2
and event counter #1.
Timer/counter #0
Fig. 4-36 Block Diagram of the Event Counter
Noise
eliminator
8-bit
counter
Internal bus
f
4
x
T1
GATEC.0
Overflow
flag
IRQT1
TM1.4
PD75238
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