4553 datasheet(65/145 Pages) RENESAS

65 / 145 page

Rev.3.02

Dec 22, 2006

page 65 of 142

REJ03B0024-0302

4553 Group

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 un-

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

operations after count starts.

Fig. 63 Timer count start timing and count time when opera-

tion starts (Timer 2 and Timer LC)

Fig. 62 Timer count start timing and count time when opera-

tion starts (Prescaler and Timer 1)

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) af-

ter Prescaler and Timer 1 operations start (1).

Time to first underflow (3) is shorter (for up to 1 period of the

count source) than time among next underflow (4) 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 in-

put.

(1) Timer Start

Count Source

Timer Value

Timer Underflow signal

032

103

(4)

(3)

(2)

Count Source

Selecting CNTR input

falling edge

(1) Timer Start

Count Source

Timer Value

Timer Underflow Signal

032

103

(4)

(3)

(2)

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 watchdog timer function is valid after system is returned from

the power down state. When not using the watchdog timer func-

tion, execute the DWDT instruction and the WRST instruction

continuously every system is returned from the power down

state, and stop the watchdog timer function.

• When the watchdog timer function and power down function are

used at the same time, execute the WRST instruction before sys-

tem enters into the power down state and initialize the flag

WDF1.

Multifunction

• Be careful that the output of port D5 can be used even when INT

pin is selected.

The threshold value is different between port D5 and INT. Accord-

ingly, be careful when the input of both is used.

• Be careful that the “H” output of port C can be used even when

output of CNTR pin are selected.

Program counter

Make sure that the PCH does not specify after the last page of

the built-in ROM.

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