4559 datasheet(37/148 Pages) RENESAS

37 / 148 page

Rev.1.04

Aug 23, 2007

Page 37 of 146

REJ03B0188-0104

4559 Group

(11) Precautions

• Prescaler

Stop prescaler counting and then execute the TABPS

instruction to read its data.

Stop prescaler counting and then execute the TPSAB

instruction to write data to prescaler.

• Timer count source

Stop timer 1, 2, 3 or LC counting to change its count source.

• Reading the count value

Stop timer 1 or 2 counting and then execute the TAB1 or

TAB2 instruction to read its data.

• Writing to the timer

Stop timer 1, 2 or LC counting and then execute the T1AB,

T2AB, T2R2L or TLCA instruction to write data to timer.

• Writing to reload register

In order to write a data to the reload register R1 while the timer

1 is operating, execute the TR1AB instruction except a timing

of the timer 1 underflow.

In order to write a data to the reload register R2H while the

timer 2 is operating, execute the T2HAB instruction except a

timing of the timer 3 underflow.

• PWM signal

If the timer 2 count stop timing and the timer 2 underflow

timing overlap during output of the PWM signal, a hazard may

occur in the PWM output waveform.

When “H” interval expansion function of the PWM signal is

used, set “1” or more to reload register R2H.

Set the port C output latch to “0” to output the PWM signal

from C/CNTR pin.

•Timer 3

Stop timer 3 counting to change its count source.

When operating timer 3 during clock operating mode, set 1

cycle or more of count source to the following period; from

setting bit 2 of register W3 to “1” till executing the POF

instruction.

• Prescaler and timer 1 count start timing and count time when

operation starts

Count starts from the first rising edge of the count source (2) in

Figure 35 after prescaler and timer operations start (1) in

Figure 35.

Time to first underflow (3) in Figure 35 is shorter (for up to 1

period of the count source) than time among next underflow

(4) in Figure 35 by the timing to start the timer and count

source operations after count starts.

When selecting CNTR input as the count source of timer 1,

timer 1 operates synchronizing with the falling edge of CNTR

input.

Fig 35. Timer count start timing and count time when

operation starts

• Timer 2 and Timer LC count start timing and count time when

operation starts

Count starts from the rising edge (2) after the first falling edge

of the count source, after Timer 2 and Timer LC operations

start (1).

Time to first underflow (3) is different from time among next

underflow (4) by the timing to start the timer and count source

operations after count starts.

Fig 36. Timer count start timing and count time when

operation starts (Timer 2 and Timer LC)

Count source

(3)

(4)

(1) Timer start

(2)

Count source

(When falling edge of

CNTR input is selected)

Timer 1 value

Timer 1 underflow signal

Count source

(3)

(4)

(1) Timer start

(2)

Timer value

Timer underflow signal

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