4553 datasheet(39/145 Pages) RENESAS

39 / 145 page

Rev.3.02

Dec 22, 2006

page 39 of 142

REJ03B0024-0302

4553 Group

Fig. 28 Timer 2 count start/stop timing

(R2L)

(R2H)

(R2L)

Timer 2 count start timing

Waveform extension function of CNTR output “H” interval: Invalid (W22 = “0”),

CNTR output: valid (W23 = “1”),

Count source: XIN input selected (W20 = “0”),

Reload register R2L: “0316”

Reload register R2H: “0216”

Timer 2 count start timing

TW2A instruction execution cycle (W21)

← 1

0216 0116 0016

0216

0316

0216 0116 0016

0316

0216

0016

0016 0216 0116 0016 0316 0216 0116

0216

(R2H)

(R2L)

0116

(R2H)

(Note 1)

Notes 1: In order to stop timer 2 at CNTR output valid (W23 = “1”), avoid a timing when timer 2 underflows.

If these timings overlap, a hazard may occur in a CNTR output waveform.

2: At CNTR output valid, timer 2 stops after “H” interval of PWM signal set by reload register R2H is output.

Mi+1

Mi+2

Mi+1

Mi+2

0116

Timer 2 count value

(Reload register)

Timer 2

underflow signal

PWM signal

Machine cycle

XIN input

(count source selected)

System clock

f(STCK)=f(XIN)/4

Timer 2 count stop timing

TW2A instruction execution cycle (W21)

← 0

Timer 2 count stop timing

Timer 2 count value

(Reload register)

Timer 2

underflow signal

PWM signal

Machine cycle

XIN input

(count source selected)

System clock

f(STCK)=f(XIN)/4

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