UPD780078 Datasheet, PDF (162/592 Pages) NEC – 8-Bit Single-Chip Microcontrollers

CHAPTER 8 16-BIT TIMER/EVENT COUNTERS 00, 01
Figure 8-20. External Event Counter Configuration Diagram
Internal bus
fX/2³
Noise eliminator
Valid edge of TI00n
16-bit timer capture/compare
register 00n
Match
Clear
16-bit timer counter 0n (TM0n)
INTTM00n
OVF0n^Note
Note OVF0n is 1 only when 16-bit timer capture/compare register 00n is set to FFFFH.
Figure 8-21. External Event Counter Operation Timing (with Rising Edge Specified)
TI00n pin input
TM0n count value 0000H 0001H 0002H 0003H 0004H 0005H
CR00n
N
INTTM00n
N–1 N 0000H 0001H 0002H 0003H
Caution When reading the external event counter count value, TM0n should be read.
Remark n = 0, 1
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User’s Manual U14260EJ3V1UD