R27 datasheet(200/487 Pages) RENESAS

200 / 487 page

R8C/26 Group, R8C/27 Group

14. Timers

Rev.2.10

Sep 26, 2008

Page 181 of 453

REJ09B0278-0210

14.3

Timer RC

14.3.1

Overview

Timer RC is a 16-bit timer with four I/O pins.

Timer RC uses either f1 or fOCO40M as its operation clock. Table 14.11 lists the Timer RC Operation Clock.

Table 14.12 lists the Timer RC I/O Pins, and Figure 14.26 shows a Timer RC Block Diagram.

Timer RC has three modes.

• Timer mode

- Input capture function

The counter value is captured to a register, using an external signal as the trigger.

- Output compare function

Matches between the counter and register values are detected. (Pin output state

changes when a match is detected.)

The following two modes use the output compare function.

• PWM mode

Pulses of a given width are output continuously.

• PWM2 mode

A one-shot waveform or PWM waveform is output following the trigger after

the wait time has elapsed.

Input capture function, output compare function, and PWM mode settings may be specified independently for

each pin.

In PWM2 mode waveforms are output based on a combination of the counter or the register.

Table 14.11

Timer RC Operation Clock

Condition

Timer RC Operation Clock

Count source is f1, f2, f4, f8, f32, or TRCCLK input (bits TCK2 to TCK0 in

TRCCR1 register are set to a value from 000b to 101b)

Count source is fOCO40M (bits TCK2 to TCK0 in TRCCR1 register are set

to 110b)

fOCO40M

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