7545 datasheet(33/62 Pages) RENESAS

33 / 62 page

Rev.1.06

Mar 07, 2008

Page 33 of 59

REJ03B0140-0106

7545 Group

Fig. 32 Setting of carrier wave control by software

0 X X 0 0X 1 X

0 0 0 0 0 X1 X

0 0 0 0 X X XX

X X X X X X XX

0 X X 0 0 0 1X

0 0 0 0 0 X0 X

0 X X 0 00 1 X

0 0 0 0 0 X1 X

0 X X 00 00 X

P42/CARR pin output

Carrier waveform

(Timer 2 output)

Software carrier wave output bit

Waveform output timing of remote-control waveform by software carrier waveform output bit

Set “1” to bit 1 to stop counting of timer 2.

Timer 1, 2, 3 control register TC123 (2B16)

Set “0” to bit 1 to start counting of timer 2.

Carrier wave control register, CARCNT (2716)

Timer 1, 2, 3 control register TC123 (2B16)

Set “1” to bit 1 to stop counting of timer 2.

Carrier wave control register, CARCNT (2716)

Timer count source set register TCSS (2A16)

Set timer 2 count source to bit 0 and bit 1. Also, in order to initialize

carrier waveform circuit, be sure to select f(XIN)/16, f(XIN)/2 or f(XIN)/8

for timer 3 count source.

Do not select carrier waveform output (b3b2=112) for timer 3 count source.

Carrier wave control register, CARCNT (2716)

Timer 2 secondary T2S (2D16)

Timer 2 primary T2P (2C16)

Set carrier wave “H”, “L” duration to timer 2 primary and timer 2 secondary, respectively.

(when 455 kHz carrier waveform generating mode is used,

this setting is not necessary.)

Waveform output of remote-control

Start (initial state after reset)

Timer 1, 2, 3 control register TC123 (2B16)

Generating waveform or not can be controlled by

bit 2: Software carrier waveform output bit

In order to stop carrier waveform,

set bit 2: Software carrier waveform output bit to “0: Output invalid”.

X: Set it to “0” or “1” arbitrary.

When the carrier wave output circuit operation is started again,

execute the setting from the processing No.4 .

In order to change the carrier wave control from the auto-control by timer 3

to software carrier wave output, initialize the carrier wave circuit

by setting “0” to “bit 1: carrier wave output valid bit”.

Set carrier wave control register.

bit 0: Set whether to expand waveform.

bit 1: Select “1: Carrier waveform generating function is valid”

bit 2: Select “0: Software output is invalid”

bit 3: Select “0: auto-control by timer 3 is invalid.

bit 4: Select “0: carrier waveform output trigger is invalid”

bit 5: Select whether 455 kHz carrier waveform generating mode is valid or invalid.

bit 6: Set output level of waveform.

bit 7: Set this bit to “0”.

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