H8SX1663 datasheet(593/1158 Pages) RENESAS

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Section 10 16-Bit Timer Pulse Unit (TPU)

Rev.1.00 Jun. 07, 2006 Page 541 of 1102

REJ09B0294-0100

(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 10.8 shows an example of the setting procedure for input capture operation.

Select input capture input

Input selection

Start count

[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 10.8 Example of Setting Procedure for Input Capture Operation

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