8-Bit Timer/Event Counters 5 And 6 Precautions; Bit Timer Registers 5 And 6 Start Timings; External Event Counter Operation Timings - NEC PD78076 User Manual

10.5 8-Bit Timer/Event Counters 5 and 6 Precautions

(1) Timer start errors
An error with a maximum of one clock might occur concerning the time required for a match signal to be
generated after the timer starts. This is because 8-bit timer registers 5 and 6 are started asynchronously
with the count pulse.
Figure 10-19. 8-bit Timer Registers 5 and 6 Start Timings
Count Pulse
TM5, TM6 Count Value
(2) Compare registers 50 and 60 sets
The 8-bit compare registers (CR50 and CR60) can be set to 00H.
Thus, when an 8-bit compare register is used as an event counter, one-pulse count operation can be carried
out.
Figure 10-20. External Event Counter Operation Timings
TI5, TI6 Input
CR50, CR60
TM5, TM6 Count Value
TO5, TO6
Interrupt Request Flag
CHAPTER 10 8-BIT TIMER/EVENT COUNTERS 5 AND 6
00H 01H
Timer Start
00H
02H 03H
00H
00H 00H
04H
00H
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