Renesas H8SX/1650, Руководство по оборудованию

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Section 9 16-Bit Timer Pulse Unit (TPU)
Rev.2.00 Jun. 28, 2007 Page 350 of 666
REJ09B0311-0200
(3)
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 detection 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, P
φ
/1 should not be selected as the counter input clock used for input capture
input. Input capture will not be generated if P
φ
/1 is selected.
(a)
Example of setting procedure for input capture operation
Figure 9.8 shows an example of the setting procedure for input capture operation.
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 9.8 Example of Setting Procedure for Input Capture Operation