R8CSLASH20 datasheet(197/501 Pages) RENESAS

197 / 501 page

R8C/20 Group, R8C/21 Group

14. Timers

Rev.2.00 Aug 27, 2008

Page 181 of 458

REJ09B0250-0200

Figure 14.44

Registers TRDGRAi, TRDGRBi, TRDGRCi and TRDGRDi in Input Capture Function

The following registers are disabled in the input capture function:

TRDOER1, TRDOER2, TRDOCR, TRDPOCR0 and TRDPOCR1

i = 0 or 1, j = either A, B, C or D

BFCi, BFDi: Bits in TRDMR Register

Set the pulse width of the input capture signal applied to the TRDIOji pin to 3 cycles or more of the Timer RD

operation clock (refer to Table 14.11 Timer RD Operation Clocks) for “no digital filter” (the DFj bit in the

TRDDFi register is set to 0).

Table 14.24

TRDGRji Register Functions in Input Capture Function

Setting

Input-Capture Input Pin

TRDGRAi

−

General register

The value in the TRDi register can be read at the input

capture.

TRDIOAi

TRDGRBi

TRDIOBi

TRDGRCi

BFCi = 0

General register

The value in the TRDi register can be read at the input

capture.

TRDIOCi

TRDGRDi

BFDi = 0

TRDIODi

TRDGRCi

BFCi = 1

Buffer register

The value in the TRDi register can be read at the input

capture. (Refer to 14.3.2 Buffer Operation)

TRDIOAi

TRDGRDi

BFDi = 1

TRDIOBi

Timer RD General Register Ai, Bi, Ci and Di (i = 0 or 1)

(1)

Symbol

Address

After Reset

TRDGRA0

TRDGRB0

TRDGRC0

TRDGRD0

TRDGRA1

TRDGRB1

TRDGRC1

TRDGRD1

0149h-0148h

014Bh-014Ah

014Dh-014Ch

014Fh-014Eh

0159h-0158h

015Bh-015Ah

015Dh-015Ch

015Fh-015Eh

FFFFh

NOTE:

(b8)

(b15)

Function

Refer to Table 14.24 TRDGRji Register Functions in Input Capture Function

Access the TRDGRAi to TRDGRDi registers in 16-bit units. Do not access them in 8-bit units.

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