Fujitsu MB90460 Series Hardware Manual page 293

CHAPTER 13 16-BIT PPG TIMER
■ Single-shot Mode (PCNTL: MDSE = 1)
For single-shot operation, a single pulse of specified width can be output by a valid trigger. When
retriggering is enabled, the counter is reloaded if an edge is detected during operation.
a) Retriggering is disabled (PCNTH: RTRG = 0)
Counter value
m
n
0
Software trigger
PPG
(normal polarity)
PPG
(inverted polarity)
b) Retriggering is enabled (PCNTH: RTRG = 1)
Counter value
m
n
0
Software trigger
PPG
(normal polarity)
PPG
(inverted polarity)
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Figure 13.6-3 Retriggering is disabled in Single-shot Mode
Rising edge detected
(1)
(2)
(1) = (n+1)*T ns
(2) = (m+1)*T ns
Figure 13.6-4 Retriggering is enabled in Single-shot Mode
Rising edge detected
(1) = (n+1)*T ns
(2) = (m+1)*T ns
Trigger is ignored
T: Count clock period
m: PCSR value
n: PDUT value
Restarted by trigger
(1)
(2)
m: PCSR value
Time
Time
T: Count clock period
n: PDUT value