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R8C/2G Group

17. Timers

Rev.1.00

Apr 04, 2008

Page 144 of 318

REJ09B0387-0100

NOTE:

1. Rectangular waves are output in these modes. Since the waves are inverted at each overflow, the “H” and “L”

level widths of the pulses are the same.

Table 17.1

Functional Comparison of Timers

Item

Timer RA

Timer RB

Timer RE

Timer RF

Configuration

8-bit timer with 8-bit

prescaler (with reload

8-bit timer with 8-bit

prescaler (with reload

4-bit counter

8-bit counter

16-bit timer (with

input capture and

output compare)

Count

Decrement

Increment

Count sources

• f1

•f2

•f8

•fOCO

•fC32

•f1

•f2

•f8

• Timer RA underflow

•f4

•f8

•f32

•fC4

•f1

•f8

•f32

Function Count of the

internal count

source

Timer mode

—

Output compare

mode

Count of the

external count

source

Event counter mode

—

External

pulse width/

period

measurement

Pulse width

measurement mode,

pulse period

measurement mode

—

Input capture mode

PWM output

Pulse output mode(1),

Event counter mode(1)

Programmable

waveform generation

mode

Output compare

mode(1)

Output compare

mode

One-shot

waveform

output

—

Programmable one-

shot generation mode,

Programmable wait

one-shot generation

mode

——

Timer

Timer mode (only fC32

count)

—

Real-time clock

mode

—

Input pin

TRAIO

INT0

—TRFI

Output pin

TRAO

TRAIO

TRBO

TREO

TRFO00 to TRFO02,

TRFO10 to TRFO12

Related interrupt

Timer RA interrupt,

INT1 interrupt

Timer RB interrupt,

INT0 interrupt

Timer RE interrupt Timer RF interrupt,

Compare 0 interrupt,

Compare 1 interrupt,

Capture interrupt

Timer stop

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