Operation Of 16-Bit Input Capture - Fujitsu MB91260B Series Hardware Manual

11.6.3

Operation of 16-bit Input Capture

Input capture is used detect specified valid edges. When a valid edge is detected, the
interrupt flag is set, and the value of the 16-bit free-run timer is loaded into the capture
register.
■ Operation of 16-bit Input Capture
Count value
FFFF
H
BFFF
H
7FFF
H
3FFF
H
0000
H
Reset
IC0
IC1
Example of IC
Capture
register0
Capture
register1
Example of
capture register
Capture 0
interrupt
Capture 1
interrupt
Example of
capture interrupt
Capture 0 : Rising edge
Capture 1 : Falling edge
Capture example: both edge
Figure 11.6-19 Example of Input Capture Timing
3FFF
Undefined Undefined
H
Undefined Undefined
Undefined Undefined
CHAPTER 11 MULTIFUNCTIONAL TIMER
BFFF 3FFF
H H
Generate interrupt by valid edge again
Clear interrupt by software
Time
7FFF
H
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