HD643303x Hitachi, HD643303x Datasheet - Page 232
HD643303x
Manufacturer Part Number
HD643303x
Description
Hitachi Microcomputer
Manufacturer
Hitachi
Datasheet
1.HD643303X.pdf
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Input Capture Function: The TCNT value can be captured into a general register when a
transition occurs at an input capture/output compare pin (TIOCA or TIOCB). Capture can take
place on the rising edge, falling edge, or both edges. The input capture function can be used to
measure pulse width or period.
•
ø
TCNT input
clock
TCNT
GR
Compare
match signal
TIOCA,
TIOCB
Output compare timing
The compare match signal is generated in the last state in which TCNT and the general
register match (when TCNT changes from the matching value to the next value). When the
compare match signal is generated, the output value selected in TIOR is output at the output
compare pin (TIOCA or TIOCB). When TCNT matches a general register, the compare
match signal is not generated until the next counter clock pulse.
Figure 8-22 shows the output compare timing.
Sample setup procedure for input capture
Figure 8-23 shows a sample procedure for setting up input capture.
Figure 8-22 Output Compare Timing
N
N
217
N + 1
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