R8CSLASH20 datasheet(165/501 Pages) RENESAS

165 / 501 page

R8C/20 Group, R8C/21 Group

14. Timers

Rev.2.00 Aug 27, 2008

Page 149 of 458

REJ09B0250-0200

Figure 14.22

Operation Example of Programmable One-Shot Generation Mode

TOSSTF bit in TRBOCR

INT0 pin input

IR bit in TRBIC

Count source

Timer RB prescaler

underflow signal

Counter of timer RB

TRBIO pin output

TOPL bit in

TRBIOC register

Set to 1 by program

Set to 0 when interrupt request is

acknowledged, or set by program

The above applies to the following conditions.

TSTART bit in TRBCR

01h

00h

01h

00h

01h

Count starts

Timer RB primary reloads

Count starts

Timer RB primary reloads

Set to 0 by program

Waveform output starts

Waveform output ends

Waveform output starts

Waveform output ends

Set to 0 when

counting ends

Set to 1 by INT0 pin

input trigger

TRBPRE = 01h, TRBPR = 01h

TRBIOC register TOPL = 0, TOCNT = 0

INOSTG = 1 (INT0 one-shot trigger enabled)

INOSEG = 1 (edge trigger at rising edge)

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