H8SSLASH2224 datasheet(488/1071 Pages) RENESAS

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Section 11 16-Bit Timer Pulse Unit (TPU)

Rev. 5.00 Aug 08, 2006 page 402 of 982

REJ09B0054-0500

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.

Notes: 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.

* Not available in the H8S/2227 Group.

1. Example of setting procedure for input capture operation

Figure 11.9 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 11.9 Example of Setting Procedure for Input Capture Operation

2. Example of input capture operation

Figure 11.10 shows an example of input capture operation.

In this example both rising and falling edges have been selected as the TIOCA pin input

capture input edge, falling edge has been selected as the TIOCB pin input capture input edge,

and counter clearing by TGRB input capture has been designated for TCNT.

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