R8CSLASH20 datasheet(195/501 Pages) RENESAS

195 / 501 page

R8C/20 Group, R8C/21 Group

14. Timers

Rev.2.00 Aug 27, 2008

Page 179 of 458

REJ09B0250-0200

Figure 14.41

Registers TRDSR0 to TRDSR1 in Input Capture Function

Timer RD Status Register i (i = 0 or 1)

Symbol

Address

After Reset

TRDSR0

TRDSR1

0143h

0153h

11100000b

11000000b

Bit Symbol

Bit Name

Function

NOTES:

4. Edge selected by bits IOk1 to IOk0 (k = C or D) in the TRDIORCi register.

Including w hen the BFki bit in the TRDMR register is set to 1 (TRDGRki is used as the buffer register).

Edge selected by bits IOj1 to IOj0 (j = A or B) in the TRDIORAi register.

The w riting results are as follow s:

• This bit is set to 0 w hen the read result is 1 and w riting 0 to the same bit.

• This bit remains unchanged even if the read result is 0 and w riting 0 to the same bit. (This bit remains 1 even if this

bit is set to 1 from 0 after reading, and w riting 0.)

• This bit remains unchanged w hen w riting 1.

b3 b2

IMFD

b1 b0

b7 b6 b5 b4

IMFB

Input capture/compare match flag

[Source for setting this bit to 0]

Write 0 after read.(2)

[Source for setting this bit to 1]

TRDSR0 register:

fOCO128 signal edge w hen the IOA3 bit in the

TRDIORA0 register is set to 0 (fOCO128

signal) TRDIOA0 pin input edge w hen the

IOA3 bit in the TRDIORA0 register is set to 1

(TRDIOA0 input)(3)

TRDSR1 register:

Input edge of TRDIOA1 pin.(3)

Input capture/compare match flag

[Source for setting this bit to 0]

Write 0 after read.(2)

[Source for setting this bit to 1]

Input edge of TRDIOBi pin.(3)

IMFA

Input capture/compare match flag

[Source for setting this bit to 0]

Write 0 after read.(2)

[Source for setting this bit to 1]

Input edge of TRDIOCi pin.(4)

Nothing is assigned to the b5 in the TRDSR0 register. When w riting to the b5, w rite 0. When reading, its content is 1.

IMFC

Input capture/compare match flag

[Source for setting this bit to 0]

Write 0 after read.(2)

[Source for setting this bit to 1]

Input edge of TRDIODi pin.(4)

Overflow flag

[Source for setting this bit to 0]

Write 0 after read.(2)

[Source for setting this bit to 1]

When the TRDi register overflow s

—

(b7 - b6)

—

Nothing is assigned. If necessary, set to 0.

When read, the content is 1.

OVF

UDF

Underflow flag(1)

This bit is disabled in the input capture

function.

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