4282 datasheet(14/69 Pages) RENESAS

14 / 69 page

Rev.1.33

Mar 18, 2004

page 14 of 67

4282 Group

Fig. 15 Carrier wave generation example by timer 2

Fig. 14 Port CARR output control by timer 1

Port CARR output

Set the interval “a” to timer 1. Set the interval “b”

to reload register R1.

Set the interval “c”

to reload register R1.

Set the interval “d”

to reload register R1.

Timer 1 underflow

Port CARR output

Carrier wave output start

Timer 1 starts

Carrier wave output start

Count source CARRY selected

Auto-control valid

Auto-control invalid

Timer 1 stop

Carrier wave output stop

(Note)

(V11)

←0

(V10)

←1

(V12)

←1

(V10)

←0

CARRY

Timer 1 underflow

“H”

“L”

“1”

“0”

“H”

“L”

“1”

“0”

“H”

“L”

“1”

“0”

Note: When timer 1 is stopped, the port CARR output auto-control is terminated regardless of bit 2 (V12) of register V1.

▲▲

▲

(R2L)

(R2H)

(R2L)

(R2H)

(R2L)

(R2H)

CARRYD

(R2L)

(R2H)

(R2L)

(R2H)

(R2L)

(R2H)

Timer 2 count source

Timer 2 count value

(Reload register)

Timer 2 underflow signal

CARRYD

Timer 2 starts

Carrier wave period:

7 clocks

To expand “H” interval of carrier wave is invalid (V23=“0”)

[Count source: 4.0 MHz, Resolution: 250 ns]

To expand “H” interval of carrier wave is valid (V23=“1”)

(When count source is 4.0 MHz, carrier wave is expanded for 125 ns]

0216 0116 0016

0316

0216 0116

0216 0116 0016

0316

0216 0116 0016

0316

0216 0116 0016

0316

0216

0116 0016

0216

0116 0016

0216 0116 0016

0316

0216 0116 0016

0316

3 clocks

interval

Timer 2 count source

Timer 2 count value

(Reload register)

Timer 2 underflow signal

Timer 2 starts

3 clocks

interval

Carrier wave period:

7 clocks

Carrier wave period:

7.5 clocks

3.5 clocks

interval

3.5 clocks

interval

Carrier wave period:

7.5 clocks

Note: When to expand “H” interval of the carrier wave is valid, set “0116” or more to reload register R2H.

● In this case, the following is set;

• Timer 2 carrier wave generation function is valid (V22=“1”),

• “L” interval (0316) of carrier wave is set to reload register R2L

• “H” interval (0216) of carrier wave is set to reload register R2H

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