NEC 78K0 User Manual page 149

Figure 6-26. Control Register Settings in External Event Counter Mode
ES101 ES100 ES001
PRM00 0/1 0/1 0
Remark 0/1: Setting 0 or 1 allows another function to be used simultaneously with the external event counter.
See the description of the respective control registers for details.
Figure 6-27. Configuration Diagram of External Event Counter
f
X
Valid edge of TI000
Note OVF00 is set to 1 only when CR000 is set to FFFFH.
Figure 6-28. External Event Counter Operation Timing (with Rising Edge Specified)
TI000 pin input
TM00 count value 0000H 0001H 0002H 0003H 0004H 0005H
CR000
INTTM000
Caution When reading the external event counter count value, TM00 should be read.
CHAPTER 6 16-BIT TIMER/EVENT COUNTER 00
(with Rising Edge Specified) (2/2)
(c) Prescaler mode register 00 (PRM00)
ES000 3 2 PRM001
1 0 0 1
16-bit timer capture/compare
register 000 (CR000)
Noise eliminator
16-bit timer counter 00 (TM00)
N
User's Manual U16227EJ2V0UD
PRM000
1
Selects external clock.
Specifies rising edge for pulse width detection.
Setting invalid (setting "10" is prohibited.)
Internal bus
Match
Clear
N − 1
N
INTTM000
Note
OVF00
0000H 0001H 0002H 0003H
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