R8C2K datasheet(204/471 Pages) RENESAS

204 / 471 page

R8C/2K Group, R8C/2L Group

16. Timers

Rev.1.10

Dec 21, 2007

Page 187 of 450

REJ09B0406-0110

16.3.3.2

Buffer Operation

Bits BFC and BFD in the TRCMR register are used to select the TRCGRC or TRCGRD register as the buffer

• Buffer register for TRCGRA register: TRCGRC register

• Buffer register for TRCGRB register: TRCGRD register

Buffer operation differs depending on the mode.

Table 16.15 lists the Buffer Operation in Each Mode, Figure 16.40 shows the Buffer Operation for Input

Capture Function, and Figure 16.41 shows the Buffer Operation for Output Compare Function.

Figure 16.40

Buffer Operation for Input Capture Function

Table 16.15

Buffer Operation in Each Mode

Function, Mode

Transfer Timing

Transfer Destination Register

Input capture function

Input capture signal input

Contents of TRCGRA (TRCGRB)

Output compare function Compare match between TRC

Contents of buffer register are

transferred to TRCGRA (TRCGRB)

PWM mode

PWM2 mode

• Compare match between TRC

• TRCTRG pin trigger input

Contents of buffer register (TRCGRD)

are transferred to TRCGRB register

Transfer

n-1

n+1

TRCIOA input

TRC register

The above applies under the following conditions:

• The BFC bit in the TRCMR register is set to 1 (the TRCGRC register functions as the buffer register for the TRCGRA register).

• Bits IOA2 to IOA0 in the TRCIOR0 register are set to 100b (input capture at the rising edge).

Transfer

TRCGRC

TRCGRA

TRC

TRCIOA input

(input capture signal)

TRCGRA register

TRCGRC register

(buffer)

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