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CHAPTER 9 8-BIT TIMER/EVENT COUNTER
220
9.5 Cautions on 8-Bit Timer/Event Counter Operating
(1) Timer start errors
An error of one clock maximum may occur concerning the time required for a match signal to be generated after
timer start. This is because 8-bit timer registers 1 and 2 (TM1 and TM2) are started asynchronously with the
count pulse.
Figure 9-14. 8-Bit Timer Register Start Timings
(2) 8-bit compare registers 1 and 2 sets
The 8-bit compare registers (CR10 and CR20) can be set to 00H.
Therefore, when the 8-bit compare register is used as event counter, one-pulse count operation can be carried
out.
When the 8-bit compare registers are used as 16-bit timer/event counter, write data to CR10 and CR20 after
setting bit 0 (TCE1) of the 8-bit timer mode control register (TMC1) to 0 and stopping timer operation.
Figure 9-15. External Event Counter Operation Timings
Count Pulse
TM1, TM2 Count Value
00H
01H
02H
03H
04H
Timer Start
TI1, TI2 Input
CR10, CR20
00H
TM1, TM2 Count Value
00H
00H
00H
00H
TO1, TO2
Interrupt Request Flag
Содержание 78014Y Series
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