Renesas H8S/2318 series, Hardware Manual

Page: 370 / 1121

Rev. 5.00, 12/03, page 340 of 1088
Input Capture Function: The TCNT value can be transferred to TGR on detection of the TIOC
pin input edge.
Rising edge, falling edge, or both edges can be selected as the detected edge. For channels 0, 1, 3,
and 4, it is also possible to specify another channel’s counter input clock or compare match signal
as the input capture source.
Note: When another channel’s counter input clock is used as the input capture input for channels
0 and 3,
φ
/1 should not be selected as the counter input clock used for input capture input.
Input capture will not be generated if
φ
/1 is selected.
•
Example of input capture operation setting procedure
Figure 9-12 shows an example of the input capture operation setting procedure.
Select input capture input
Input selection
Start count
<Input capture operation>
[1]
[2]
[1] Designate TGR as an input capture register by
means of TIOR, and select the input capture
source and input signal edge (rising edge, falling
edge, or both edges).
[2] Set the CST bit in TSTR to 1 to start the count
operation.
Figure 9-12 Example of Input Capture Operation Setting Procedure