R29 datasheet(174/473 Pages) RENESAS

174 / 473 page

R8C/28 Group, R8C/29 Group

14. Timers

Rev.2.10

Sep 26, 2008

Page 155 of 441

REJ09B0279-0210

Figure 14.15

Registers TRBPRE, TRBSC, and TRBPR

Timer RB Prescaler Register

(1)

Symbol

Address

After Reset

TRBPRE

010Ch

FFh

Mode

Function

Setting Range

NOTE:

Timer mode

00h to FFh

Counts an internal count source or timer RA

underflow s

00h to FFh

When the TSTOP bit in the TRBCR register is set to 1, the TRBPRE register is set to FFh.

Programmable w aveform

generation mode

00h to FFh

Programmable one-shot

generation mode

00h to FFh

Programmable w ait one-shot

generation mode

Timer RB Secondary Register

(3, 4)

Symbol

Address

After Reset

TRBSC

010Dh

FFh

Mode

Function

Setting Range

NOTES:

Timer mode

—

Disabled

00h to FFh

WO(2)

Counts timer RB prescaler underflow s(1)

00h to FFh

Programmable one-shot

generation mode

Disabled

00h to FFh

—

Programmable w aveform

generation mode

To w rite to the TRBSC register, perform the follow ing steps.

(1) Write the value to the TRBSC register.

(2) Write the value to the TRBPR register. (If the value does not change, w rite the same value second time.)

The count value can be read out by reading the TRBPR register even w hen the secondary period is being counted.

Programmable w ait one-shot

generation mode

Counts timer RB prescaler underflow s

(one-shot w idth is counted)

00h to FFh

WO(2)

The values of registers TRBPR and TRBSC are reloaded to the counter alternately and counted.

When the TSTOP bit in the TRBCR register is set to 1, the TRBSC register is set to FFh.

Timer RB Primary Register

(2)

Symbol

Address

After Reset

TRBPR

010Eh

FFh

Mode

Function

Setting Range

NOTES:

Programmable w ait one-shot

generation mode

Counts timer RB prescaler underflow s

(w ait period w idth is counted)

00h to FFh

Timer mode

Counts timer RB prescaler underflow s

00h to FFh

When the TSTOP bit in the TRBCR register is set to 1, the TRBPR register is set to FFh.

Programmable w aveform

generation mode

Counts timer RB prescaler underflow s(1)

00h to FFh

Programmable one-shot

generation mode

Counts timer RB prescaler underflow s

(one-shot w idth is counted)

00h to FFh

The values of registers TRBPR and TRBSC are reloaded to the counter alternately and counted.

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