R8CSLASH20 datasheet(153/501 Pages) RENESAS

153 / 501 page

R8C/20 Group, R8C/21 Group

14. Timers

Rev.2.00 Aug 27, 2008

Page 137 of 458

REJ09B0250-0200

14.2

Timer RB

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

The prescaler and timer consist of the reload register and counter. (Refer to Table 14.7 to 14.10 the Specification

of Each Modes).

Timer RB contains the timer RB primary and timer RB secondary as the reload register.

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

and reloading.

Figure 14.13 shows the Block Diagram of Timer RB. Figures 14.14 and 14.16 show the registers associated with

timer RB.

Timer RB contains 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 one-shot pulse.

• Programmable wait one-shot generation mode: The timer outputs delayed one-shot pulse.

Figure 14.13

Block Diagram of Timer RB

INT0PL bit

= 00b

= 01b

= 11b

= 10b

Timer RA underflow

TCK1 to TCK0 bit

TSTART bit

TRBPRE register

(Prescaler)

Timer RB interrupt

INT0 interrupt

TCSTF bit

Toggle flip-flop

CLR

TOPL = 1

TOPL = 0

TRBO pin

TOCNT = 0

TOCNT = 1

P3_1 bit in P3 register

TMOD1 to TMOD0 bit

= 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 bit

= 01b, 10b, 11b

TMOD1 to TMOD0 bit

= 01b, 10b, 11b

Counter

Reload

Counter (timer RB)

Reload

TRBPR

Peripheral data bus

TRBSC

Reload

TCKCUT bit

INOSTG bit

TSTART, TCSTF: TRBCR register

TOSST: TRBOCR register

TOPL, TOCNT, INOSTG, INOSEG: TRBIOC register

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

(Timer)

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