M34282M2-XXXGP 데이터 시트보기 (PDF) - Renesas Electronics

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M34282M2-XXXGP

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

Renesas Electronics 

4282 Group

● 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

Timer 2 count start timing

Machine cycle Mi

Instruction clock

=f(XIN)/8

XIN

XIN/2

(Count source selected)

Register V20

Timer 2 count value

(Reload register)

Timer 2 underflow signal

CARRYD

Mi + 1

Mi + 2

TV2A instruction execution cycle (V20) ←1

0316

(R2L)

0216 0116 0016 0216 0116 0016 0316 0216

(R2H)

(R2L)

Timer 2 count start timing

Timer 2 count stop timing

Machine cycle Mi

Mi + 1

Instruction clock

=f(XIN)/8

TV2A instruction execution cycle (V20)←0

XIN

XIN/2

(Count source selected)

Register V20

Timer 2 count value

(Reload register)

Timer 2 underflow signal

0016 0316 0216 0116 0016 0216 0116 0016 0316 0216 0116 0016 0216

(R2L)

(R2H)

(R2L)

(R2H)

Mi + 2

CARRYD

(Note 1)

Timer 2 count stop timing

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.

Fig. 16 Timer 2 count start/stop timing

Rev.1.33 Mar 18, 2004 page 15 of 67

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