Samsung C8249 用户手册

F

This example sets Timer B to the repeat mode, sets the oscillation frequency as the Timer B clock source, and
TBDATAH and TBDATAL to make a 38 kHz,1/3 Duty carrier frequency. The program parameters are:

17.59 

µ

s

37.9 kHz 1/3 Duty

8.795 

µ

s

— Timer B is used in repeat mode

— Oscillation frequency is 4 MHz (0.25

 µ

s)

— TBDATAH =  8.795

 µ

s/0.25

 µ

s = 35.18, TBDATAL = 17.59

 µ

s/0.25

 µ

s = 70.36

— Set P3.0 to TBPWM mode.

ORG

0100H

;

Reset address

START

DI

•

•

•

LD

TBDATAL,#(70-2)

;

Set 17.5

 µ

s

LD

TBDATAH,#(35-2)

;

Set 8.75

 µ

s

LD

TBCON,#00000110B

;

Clock Source  

←

  fxx

;

Disable Timer B interrupt.

;

Select repeat mode for Timer B.

;   Start Timer B operation.
;   Set Timer B Output flip-flop (TBOF) high.
;

LD

P3CONL,#02H

;

Set P3.0 to TBPWM mode.

;

This command generates 38 kHz, 1/3 duty pulse signal
through P3.0.

•

•

•