SH7144_08 Datasheet, PDF (307/930 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family/SH7144 Series

11. Multi-Function Timer Pulse Unit (MTU)
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 and 1,
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 1, Pφ/1 should not be selected as the counter input clock used for input capture
input. Input capture will not be generated if Pφ/1 is selected.
1. Example of Input Capture Operation Setting Procedure
Figure 11.9 shows an example of the input capture operation setting procedure.
Input selection
Select input capture input
[1]
Start count
[2]
[1] Designate TGR as an input capture
register by means of TIOR, and select
rising edge, falling edge, or both edges
as the input capture source and input
signal edge.
[2] Set the CST bit in TSTR to 1 to start
the count operation.
<Input capture operation>
Figure 11.9 Example of Input Capture Operation Setting Procedure
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, the 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.
Rev.4.00 Mar. 27, 2008 Page 263 of 882
REJ09B0108-0400