7545 datasheet(31/62 Pages) RENESAS

31 / 62 page

Rev.1.06

Mar 07, 2008

Page 31 of 59

REJ03B0140-0106

7545 Group

Fig. 29 Control waveform diagram of CARR output by timer 3

Fig. 30 Waveform diagram in 455 kHz carrier wave generating mode

06 05 04 03 02 01 00

02 01 00 03

01 00 03 02

02 01 00

02 01 00 03

01 00 03 02

02 01

P42/CARR pin output

Timer 3 count source

(carrier wave output selected)

Timer 3 interrupt

Timer 3 count value

Count period

Generating carrier waveform

or not is controlled by setting

carrier waveform output trigger bit.

Carrier waveform output trigger bit

Writing to timer 3

in this duration

Count value of next period

is changed

Successive carrier waveform

is not generated in this duration.

2.250

µs X 9 waveforms + 2.125 µs X 7 waveforms

2.125

µs waveform duration (7 waveforms)

35.125

µs (16 waveforms), Average waveform = 2.195 µs (Frequency = 455.516 kHz)

Waveform period in 455 kHz carrier waveform generating mode

Waveform length: 2.250

µs-waveform

Waveform length: 2.125

µs-waveform

2.250

µs

5-clock

4-clock

2.125

µs

4.5-clock

4-clock

Carrier waveform

Timer 2 count source

Carrier waveform

Timer 2 count source

Carrier waveform

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