Samsung S3C84E5 user manual Org, 0100H Reset address, Start DI, P4CONLH,#03H, 11-9

S3C84E5/C84E9/P84E9 8-BIT TIMER A/B

FPROGRAMMING TIP — To Generate 38 kHz, 1/3duty signal through P4.3

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:

8.795 μs

17.59 μs

37.9 kHz 1/3 Duty

—Timer B is used in repeat mode

—Oscillation frequency is 16 MHz (0.0625 μs), fx=fxx/4=4MHz (0.25 μs)

—TBDATAH = 8.795 μs/0.25 μs = 35.18, TBDATAL = 17.59 μs/0.25 μs = 70.36

—Set P4.3 to TBPWM mode.

ORG 0100H ; Reset address

START DI

•
•
•
LD	TBDATAL,#(35-1)	;	Set 17.5 μs
LD	TBDATAH,#(70-1)	;	Set 8.75 μs
LD	TBCON,#00100111B	;	Clock Source ← fxx/4

;Disable Timer B interrupt.

;Select repeat mode for Timer B.

;Start Timer B operation.

;Set Timer B Output flip-flop (T-FF) high.

LD P4CONLH,#03H ; Set P4.3 to TBPWM mode.

;This command generates 38 kHz, 1/3 duty pulse signal through P4.3.

•

•

•

11-9