R8C/20 Group, R8C/21 Group 14. Timers
Rev.2.00 Aug 27, 2008 Page 170 of 458
REJ09B0250-0200
14.3.5 Input Capture Function
The input capture function is to measure the external signal width and period. The content in the TRDi register
(counter) is transferred to the TRDGRji register as a trigger of the TRDIOji (i = 0 or 1, j = either A, B, C or D)
pin external signal (input capture). Since this function is enabled with a combination of the TRDIOji pin and
TRDGRji register, any of the input capture function, other modes or functions can be selected every pin.
The TRDGRA0 register can also select fOCO128 signal as input-capture trigger input.
Figure 14.33 shows the Block Diagram of Input Capture Function, Table 14.23 lists the Input Capture Function
Specifications. Figures 14.34 to 14.44 show the Registers Associated with Input Capture Function and Figure
14.45 shows the Operating Example of Input Capture Function.
Figure 14.33 Block Diagram of Input Capture Function
i = 0 or 1
NOTES:
1. When the BFCi bit in the TRDMR register is set to 1 (the TRDGRCi register is used as the buffer register of the TRDGRAi
register).
2. When the BFDi bit in the TRDMR register is set to 1 (the TRDGRDi register is used as the buffer register of the TRDGRBi
register).
3. The trigger input of the TRDGRA0 register can select the TRDIOA0 pin input or fOCO128 signal.
TRDGRAi
register
TRDi register
Input capture signal
TRDIOAi
(3)
TRDGRCi
register
TRDGRBi
register
Input capture signal
TRDGRDi
register
TRDIOBi
(Note 1)
(Note 2)
TRDIOCi
TRDIODi
TRDIOA0
Divided
by 128
IOA3 = 0
IOA3 = 1
fOCO
fOCO128
Input capture
signal
Input capture signal
Input capture signal
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