R8C2K datasheet(176/471 Pages) RENESAS

176 / 471 page

R8C/2K Group, R8C/2L Group

16. Timers

Rev.1.10

Dec 21, 2007

Page 159 of 450

REJ09B0406-0110

Figure 16.18

Operating Example of Timer RB when Counter Value is Rewritten during Count

Operation

Count source

Reloads register of

timer RB prescaler

IR bit in TRBIC

Counter of

timer RB prescaler

Reloads register of

timer RB

Counter of timer RB

Set 01h to the TRBPRE register and 25h to

the TRBPR register by a program.

After writing, the reload register is

written with the first count source.

Reload with

the second

count source

Reload on

underflow

After writing, the reload register is

written on the first underflow.

Reload on the second

underflow

The IR bit remains unchanged until underflow

is generated by a new value.

When the TWRC bit is set to 0 (write to reload register and counter)

Count source

Reloads register of

timer RB prescaler

IR bit in TRBIC

Counter of

timer RB prescaler

Reloads register of

timer RB

Counter of timer RB

Set 01h to the TRBPRE register and 25h to

the TRBPR register by a program.

After writing, the reload register is

written with the first count source.

Reload on

underflow

After writing, the reload register is

written on the first underflow.

Reload on

underflow

Only the prescaler values are updated,

extending the duration until timer RB underflow.

When the TWRC bit is set to 1 (write to reload register only)

05h

04h

03h

02h

01h

00h

01h

00h

01h

00h

06h

01h

00h

01h

03h

00h

02h

01h

25h

New value (25h)

Previous value

New value (01h)

Previous value

New value (01h)

Previous value

05h

04h

01h

00h

01h

00h

01h

00h

01h

00h

06h

New value (25h)

Previous value

03h

24h

02h

25h

The above applies under the following conditions.

Both bits TSTART and TCSTF in the TRBCR register are set to 1 (During count).

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