4559 datasheet(70/148 Pages) RENESAS

70 / 148 page

Rev.1.04

Aug 23, 2007

Page 70 of 146

REJ03B0188-0104

4559 Group

(11)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.

(12)Timer count source

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

(13)Reading the count value

Stop timer 1 or 2 counting and then execute the TAB1 or TAB2

instruction to read its data.

(14)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.

(15)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 T3HAB instruction except a timing of

the timer 2 underflow.

(16)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.

(17)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.

(18)Prescaler, 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 71 after prescaler and timer operations start (1) in Figure

71.

Time to first underflow (3) in Figure 71 is shorter (for up to 1

period of the count source) than time among next underflow (4)

in Figure 71 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 count edge (falling edge or

rising edge) of CNTR input selected by software.

Fig 71. Timer count start timing and count time when

operation starts (1)

(19)Timer 2, LC count start timing and count time when

operation starts

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

68 after timer 2 and LC operation start (1) in Figure 72.

Time to first underflow (3) in Figure 68 is different (for up to 1

period of the count source) from time among next underflow (4)

in Figure 72 by the timing to start the timer and count source

operations after count starts.

Fig 72. Timer count start timing and count time when

operation starts (2)

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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