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Chapter 36 Input Capture
5.Operation
5.2 Input Capture Edge Specification and Operation
• When specifying rising edge
(1) Detection of rising edge of input signal
(2) Storage of free-run timer value in capture register (capture)
(3) Input capture interrupt generation
• When specifying falling edge
(4) Detection of input signal falling edge
(5) Storage of free-run timer value in capture register (capture)
(6) Input capture interrupt generation
• Both edges
(7) Detection of input signal rising edge
(8) Storage of free-run timer value in capture register (capture)
(9) Input capture interrupt generation
(10) Clear interrupt request flag (ICS01.ICP0), (ICS01.ICP1) in software
(11) Detection of input signal falling edge
(12) Storage of free-run timer value in capture register (capture)
(13) Input capture interrupt generation
Reset
Free-run
timer 0
count value
Time
FFFFh
0000h
Overflow
(IVF)
Count value A
Count value B
Count value C
Count value D
Interrupt
request
Input capture
Falling
edge
Capture data
register
Interrupt
request
Input capture
Rising
edge
Capture data
register
Input capture
Both
edges
Interrupt
request
Clearing of flags in software
Capture data
register
(1)
(2)
(5)
(4)
(3)
(8)
(7)
(6)
(9)
(10)
(11)
(12)
(13)
Indeterminate
Count value C
Count value A
Indeterminate Count value B Count value D
Indeterminate
7)