R8C2K datasheet(244/471 Pages) RENESAS

244 / 471 page

R8C/2K Group, R8C/2L Group

16. Timers

Rev.1.10

Dec 21, 2007

Page 227 of 450

REJ09B0406-0110

16.4.5

Input Capture Function

The input capture function measures the external signal width and period. The content of 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, the input capture function, or any other mode or function, can be selected for each individual

pin.

The TRDGRA0 register can also select fOCO128 signal as input-capture trigger input.

Figure 16.69 shows a Block Diagram of Input Capture Function, Table 16.37 lists the Input Capture Function

Specifications. Figures 16.70 to 16.80 show the Registers Associated with Input Capture Function, and Figure

16.81 shows an Operating Example of Input Capture Function.

Figure 16.69

Block Diagram of Input Capture Function

i = 0 or 1

NOTE 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).

NOTE 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).

TRDGRAi

TRDi register

Input capture signal

TRDIOAi(3)

TRDGRCi

TRDGRBi

Input capture signal

TRDGRDi

TRDIOBi

(Note 1)

(Note 2)

TRDIOCi

TRDIODi

NOTE 3: The trigger input of the TRDGRA0 register

can select the TRDIOA0 pin input or

fOCO128 signal.

TRDIOA0

Divided

by 128

IOA3 = 0

IOA3 = 1

fOCO

fOCO128

Input capture

signal

Input capture signal

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