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CHAPTER 16 PWC Timer
■ Interrupt Request Generation
In the pulse-width measurement mode, the following two interrupt requests can be generated:
●
Timer overflow interrupt request
If an overflow occurs during a count, the overflow flag is set. When the overflow interrupt request is
enabled, an interrupt request is generated.
●
Measurement termination interrupt request
When the measurement termination edge is detected, the count end flag (EDIR) of PWCSH0/PWCSH1 is
set. If the measurement termination interrupt is enabled, an interrupt request is generated.
The measurement termination flag (EDIR) is automatically cleared when PWC0/ PWC1 is read.
■ Measurement Mode and Measurement Operation
Table 16.6-6 lists measurement mode operations.
Table 16.6-6
Measurement Mode Operation (1/2)
Measurement mode MOD2 MOD1 MOD0
H pulse-width
measurement
L pulse-width
measurement
Rising edge-to-rising
edge period
measurement
458
1
0
1
The H period width is measured.
Start of measurement:
Termination of measurement:
1
1
0
The L period width is measured.
Start of measurement:
End of measurement:
1
0
0
The rising edge-to-rising edge time is measured.
Start of measurement:
Termination of measurement:
Measurement operation
w w
Start of
Termination of
measurement
measurement
w w
Start of
Termination of
measurement
measurement
w w
w
Start of
Termination of
measurement
measurement
Start
w
Termination of
Start
measurement
When the rising edge is detected
When the falling edge is detected
w
Start
Termination of
measurement
When the falling edge is detected
When the rising edge is detected
w
Termination
Start
Termination
When the rising edge is detected
When the rising edge is detected
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