4282 datasheet(15/69 Pages) RENESAS

15 / 69 page

Rev.1.33

Mar 18, 2004

page 15 of 67

4282 Group

Fig. 16 Timer 2 count start/stop timing

(R2L)

(R2H)

(R2L)

Timer 2 count value

(Reload register)

Timer 2 underflow signal

CARRYD

Timer 2 count start timing

Instruction clock

=f(XIN)/8

Machine cycle

TV2A instruction execution cycle (V20)

←1

XIN

XIN/2

(Count source selected)

0216 0116 0016

0216

0316

0216 0116 0016

0316

Timer 2 count value

(Reload register)

Timer 2 underflow signal

CARRYD

Timer 2 count stop timing

Machine cycle

TV2A instruction execution cycle (V20)

←0

XIN/2

(Count source selected)

0216

0216 0116 0016

0216 0116 0016 0216 0116 0016 0316

0016

(R2H)

(R2L)

0316

(R2H)

(R2L)

(Note 1)

Mi + 1

Mi + 2

Mi + 1

Mi + 2

Instruction clock

=f(XIN)/8

XIN

● In this case, the following is set;

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

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

• Count source XIN/2 selected (V21=“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

Notes 1: When the carrier wave generation function is vaild (V22=“1”), avoid a timing

when timer 2 underflows to stop timer 2. When the timer 2 count stop occurs

at the same timing with the timer 2 underflows, hazard may occur in the carrier

wave output waveform.

2: When the timer 2 is stopped during “H” output of carrier wave while the carrier

wave generation function is valid, it is stopped after the “H” interval set by

reload register R2H is output.

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