M34571GDFP datasheet(58/126 Pages) RENESAS

58 / 126 page

Rev.1.02

May 25, 2007

Page 58 of 124

REJ03B0179-0102

4571 Group

(12)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.

(13)Timer count source

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

(14)Reading the count value

Stop timer 1, 2 or 3 counting and then execute the TAB1, TAB2

or TAB3 instruction to read its data.

(15)Writing to the timer

Stop timer 1, 2 or 3 counting and then execute the T1AB, T2AB,

T3AB or T3R3L instruction to write data to timer.

(16)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 R3H while the timer

3 is operating, execute the T3HAB instruction except a timing of

the timer 3 underflow.

(17)PWM signal

If the timer 3 count stop timing and the timer 3 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 R3H.

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

C/CNTR1 pin.

(18)Prescaler, timer 1, timer 2 and timer 3 count start

timing and count time when operation starts

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

Figure 61 after prescaler and timer operations start (1) in Figure

61.

Time to first underflow (3) in Figure 61 is shorter (for up to 1

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

in Figure 61 by the timing to start the timer and count source

operations after count starts.

When selecting CNTR0 input as the count source of timer 1,

timer 1 operates synchronizing with the count edge (falling edge

or rising edge) of CNTR0 input selected by software.

Fig 61. Timer count start timing and count time when

operation starts

(19)Watchdog timer

• The watchdog timer function is valid after system is released

from reset. When not using the watchdog timer function,

execute the DWDT instruction and the WRST instruction

continuously, and clear the WEF flag to “0” to stop the

watchdog timer function.

• The contents of WDF1 flag and timer WDT are initialized at

the RAM back-up mode.

• When using the watchdog timer and the RAM back-up mode,

initialize the WDF1 flag with the WRST instruction just

before the microcomputer enters the RAM back-up state.

Also, set the NOP instruction after the WRST instruction, for

the case when a skip is performed with the WRST instruction.

(20)External clock

Be careful that the maximum value of the oscillation frequency

when using the external clock differs from the value when using

the ceramic resonator (refer to the recommended operating

condition).

Also, note that the RAM back-up mode (POF instruction) cannot

be used when using the external clock.

(21)QzROM

(1) Be careful not to apply overvoltage to MCU. The contents

of QzROM may be overwritten because of overvoltage.

Take care especially at turning on the power.

(2) As for the product shipped in blank, Renesas does not

perform the writing test to user ROM area after the

assembly process though the QzROM writing test is

performed enough before the assembly process. Therefore, a

writing error of approx.0.1 % may occur. Moreover, please

note the contact of cables and foreign bodies on a socket,

etc. because a writing environment may cause some writing

errors.

(22)Notes On ROM Code Protect (QzROM product

shipped after writing)

As for the QzROM product shipped after writing, the ROM code

protect is specified according to the ROM option setup data in

the mask file which is submitted at ordering.

The ROM option setup data in the mask file is “0016” for protect

enabled or “FF16” for protect disabled.

Note that the mask file which has nothing at the ROM option

data or has the data other than “0016” and “FF16” can not be

accepted.

Count source

(3)

(4)

(1) Timer start

(2)

Count source

(When falling edge of

CNTR0 input is selected)

Timer 1 value

Timer 1 underflow signal

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