4553 datasheet(36/145 Pages) RENESAS

36 / 145 page

Rev.3.02

Dec 22, 2006

page 36 of 142

REJ03B0024-0302

4553 Group

• Prescaler and Timer 1 count start timing and count time when op-

eration 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.

Fig. 24 Timer count start timing and count time when opera-

tion starts (Prescaler and Timer 1)

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

eration 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. 25 Timer count start timing and count time when opera-

tion starts (Timer 2 and Timer LC)

(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)

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