R27 datasheet(178/487 Pages) RENESAS

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R8C/26 Group, R8C/27 Group

14. Timers

Rev.2.10

Sep 26, 2008

Page 159 of 453

REJ09B0278-0210

14.2

Timer RB

Timer RB is an 8-bit timer with an 8-bit prescaler.

The prescaler and timer each consist of a reload register and counter (refer to Tables 14.7 to 14.10 the

Specifications of Each Mode).

Timer RB has timer RB primary and timer RB secondary as reload registers.

The count source for timer RB is the operating clock that regulates the timing of timer operations such as counting

and reloading.

Figure 14.12 shows a Block Diagram of Timer RB. Figures 14.13 to 14.15 show the registers associated with timer

RB.

Timer RB has four operation modes listed as follows:

• Timer mode:

The timer counts an internal count source (peripheral

function clock or timer RA underflows).

• Programmable waveform generation mode:

The timer outputs pulses of a given width successively.

• Programmable one-shot generation mode:

The timer outputs a one-shot pulse.

• Programmable wait one-shot generation mode:

The timer outputs a delayed one-shot pulse.

Figure 14.12

Block Diagram of Timer RB

INT0PL bit

= 00b

= 01b

= 11b

= 10b

Timer RA underflow

TCK1 to TCK0 bits

TSTART bit

TRBPRE register

(prescaler)

Timer RB interrupt

INT0 interrupt

TCSTF bit

Toggle

flip-flop

CLR

TOPL = 1

TOPL = 0

P3_1 bit in P3 register

TMOD1 to TMOD0 bits

= 10b or 11b

TOSSTF bit

Polarity

select

INOSEG bit

Input polarity

selected to be one

edge or both edges

Digital filter

INT0 pin

INT0EN bit

TMOD1 to TMOD0 bits

= 01b, 10b, 11b

Counter

Reload

Counter (timer RB)

Reload

TRBPR

Data bus

TRBSC

Reload

TCKCUT bit

INOSTG bit

TSTART, TCSTF: Bits in TRBCR register

TOSSTF: Bit in TRBOCR register

TOPL, TOCNT, INOSTG, INOSEG: Bits in TRBIOC register

TMOD1 to TMOD0, TCK1 to TCK0, TCKCUT: Bits in TRBMR register

TRBOSEL: Bit in PINSR2 register

(Timer)

TOCNT = 0

TOCNT = 1

TMOD1 to TMOD0 bits

= 01b, 10b, 11b

TRBO (P1_3) pin

TRBOSEL = 0

TRBOSEL = 1

TRBO (P3_1) pin

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