R8CSLASH20 datasheet(156/501 Pages) RENESAS

156 / 501 page

R8C/20 Group, R8C/21 Group

14. Timers

Rev.2.00 Aug 27, 2008

Page 140 of 458

REJ09B0250-0200

Figure 14.16

Registers TRBPRE, TRBSC, and TRBPR

Timer RB Prescaler Register

(1)

Symbol

Address

After Reset

TRBPRE

010Ch

FFh

Mode

Function

Setting Range

NOTE:

1. 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

00h to FFh

Counts an internal count source or a timer RA

underflow

00h to FFh

Timer mode

Timer RB Secondary Register

(3,4)

Symbol

Address

After Reset

TRBSC

010Dh

FFh

Mode

Function

Setting Range

NOTES:

4. 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 a timer RB prescaler underflow

(one-shot w idth is counted)

00h to FFh

WO(2)

Each value in the TRBPR register and TRBSC register is 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.

WO(2)

Counts a timer RB prescaler underflow (1)

00h to FFh

Programmable one-shot

generation mode

Disable

00h to FFh

—

Programmable w aveform

generation mode

Timer mode

—

Disable

00h to FFh

Timer RB Primary Register

(2)

Symbol

Address

After Reset

TRBPR

010Eh

FFh

Mode

Function

Setting Range

NOTES:

2. 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 a timer RB prescaler underflow (1)

00h to FFh

Programmable one-shot

generation mode

Counts a timer RB prescaler underflow

(one-shot w idth is counted)

00h to FFh

Each value in the TRBPR register and TRBSC register is reloaded to the counter alternately and counted.

Timer mode

Counts a timer RB prescaler underflow

00h to FFh

Programmable w ait one-shot

generation mode

Counts a timer RB prescaler underflow

(w ait period w idth is counted)

00h to FFh

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