STC89LE52RC datasheet(107/165 Pages) STC

107 / 165 page

The following program is an assembly language code that domestrates Timer 2 programable clock/pulse out

function on P1.0.

;/*------------------------------------------------------------------------------------------------------------*/

;/* --- STC MCU International Limited ----------------------------------------------------------------*/

;/* --- STC 89xx Series MCU Timer 2 in programmable clock/pulse output mode,on P1.0------------*/

;/* If you want to use the program or the program referenced in the */

;/* article, please specify in which data and procedures from STC */

;/*--------------------------------------------------------------------------------------------------------------*/

;Declare STC89xx series MCU SFRs

;SFRs associated with Timer 2 and RS232 port

T2CON

EQU

0C8H

T2MOD

EQU

0C9H

TR2

EQU

T2CON.2

;TR2 is the second bit in SFR—T2CON

RCAP2L

EQU

0CAH

RCAP2H

EQU

0CBH

TH2

EQU

0CDH

TL2

EQU

0CCH

;Timer/Counter 2 control register T2CON

;

Reset Value

;bit-address

;T2CON(C8H)

TF2

EXF2

RCLK

TCLK

EXEN2 TR2

C//T2

CP//RL2

;T2MOD Register

;

Reset Value

;T2CON(C9H)

T2OE

DCEN

xxxxxx00B

;---------------------------------------------------------------------------------------------------------------

ORG

0000H

AJMP

MAIN

;---------------------------------------------------------------------------------------------------------------

ORG

0100H

MAIN:

MOV

SP,

#0E0H

MOV

P1,

#0FFH

;turn off P1 port LED

ACALL SET_T2_OUT_MODE

;Set Timer 2 as high-speed pulse output mode

MOV

DPTR,

#0FFF0H

;Set Timer pulse output velocity

ACALL SET_T2_OUT_SPEED

WAIT1:

SJMP

WAIT1

ACALL DELAY

ACALL PAUSE

;Pause in order to observation

MOV

DPTR,

#0FFE0H

;Set Timer pulse output velocity,lower 1/2 than last

ACALL SET_T2_OUT_SPEED

ACALL DELAY

ACALL PAUSE

;Pause in order to observation

MOV

DPTR

#0FFD0H

;Set Timer pulse output velocity,lower 1/3 than last

107

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