4571 datasheet(36/126 Pages) RENESAS

36 / 126 page

Rev.1.02

May 25, 2007

Page 36 of 124

REJ03B0179-0102

4571 Group

Fig 36. Timer count start/stop timing

(R3H)

Timer 3 underflow signal

Machine cycle

Timer 3 count start timing (R3L = “0216”, R3H = “0216”, W33 = “1”)

Mi + 1

Mi + 2

Mi + 3

0216

0016

0116

0216

0016

0116

0216

(R3L)

Timer 3 count start timing

PWM signal

Timer 3 count value

(reload register)

Timer 3 count source

(XIN input)

(R3H)

Mi + 1

Mi + 2

Mi + 3

0016

0116

0216

0016

0116

0216

Timer 3 count stop timing

(R3L)

(R3H)

(Note 1)

TW3A instruction execution (W31

←1)

TW3A instruction execution (W31

←0)

Timer 3 underflow signal

Machine cycle

PWM signal

Timer 3 count value

(reload register)

Timer 3 count source

(XIN input)

Timer 3 count stop timing (R3L = “0216”, R3H = “0216”, W33 = “1”)

Notes 1: If the timer count stop timing and the timer underflow timing overlap while the CNTR1 pin output

is valid (W33=“1”), a hazard may occur in the PWM signal waveform.

2: When timer count is stopped during “H” interval of the PWM signal, timer is stopped after

the end of the “H” output interval.

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