CHAPTER 7 8-BIT TIMER/EVENT COUNTER
User's Manual U11919EJ3V0UM00
114
7.5 Notes on Using 8-Bit Timer/Event Counters
(1)
Error on starting timer
An error of up to 1 clock occurs after the timer has been started until a coincidence signal is generated.
This is because 8-bit timer counter 00 (TM00) started asynchronously with the count pulse.
Figure 7-7. 8-Bit Timer Counter 00 Start Timing
Count Pulse
TM00 Count Value
Timer starts
00H
01H
02H
03H
04H
(2)
Setting of 8-bit compare register
8-bit compare register 00 (CR00) can be set to 00H.
Therefore, one pulse can be counted when an 8-bit timer/event counter operates as an event counter.
Figure 7-8. External Event Counter Operation Timing
TI0 Input
CR00
00H
TM00 Count Value
00H
00H
00H
00H
Interrupt Request Flag
Содержание mPD789026 Subseries
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