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CHAPTER 7 TIMER/COUNTER FUNCTION
175
Figure 7-29. Timing of One-Shot Pulse Output Operation with External Trigger (with rising edge specified)
TOn0 pin output
Count clock
TMn count value
CRn1 set value
CRn0 set value
TIn0 pin input
INTTMn1
INTTMn0
Sets TMCn to 08H.
(TMn count starts)
N
N
N
N
M + 2
M + 1
M
M
−
1
M
−
2
N
N + 2
N + 1
0000H
0001H
M
M
M
M
0000H
Caution
The 16-bit timer register starts operating as soon as a value other than 0, 0 (operation stop
mode) has been set to TMCn2 and TMCn3.
Remark
n = 0, 1
7.2.7 Cautions
(1) Error on starting timer
An error of up to 1 clock occurs before the coincidence signal is generated after the timer has been started. This
is because the 16-bit timer register n (TMn) is started asynchronously in respect to the count pulse.
Figure 7-30. Start Timing of 16-Bit Timer Register n
Remark
n = 0, 1
Count pulse
TMn count value
0004H
0003H
0002H
0001H
0000H
Timer starts
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