R8CSLASH20 datasheet(186/501 Pages) RENESAS

186 / 501 page

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

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

3. The trigger input of the TRDGRA0 register can select the TRDIOA0 pin input or fOCO128 signal.

TRDGRAi

TRDi register

Input capture signal

TRDIOAi(3)

TRDGRCi

TRDGRBi

Input capture signal

TRDGRDi

TRDIOBi

(Note 1)

(Note 2)

TRDIOCi

TRDIODi

TRDIOA0

Divided

by 128

IOA3 = 0

IOA3 = 1

fOCO

fOCO128

Input capture

signal

Input capture signal

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