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STC89C53RC датащи(PDF) 19 Page - STCmicro Technology Co,.Ltd

номер детали STC89C53RC
подробное описание детали  Enhanced 80C51 Central Processing Unit ,6T or 12T per machine cycle
PDF  165 Pages
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производитель  STC [STCmicro Technology Co,.Ltd]
домашняя страница  http://www.stcmicro.com/
Logo STC - STCmicro Technology Co,.Ltd

STC89C53RC датащи(HTML) 19 Page - STCmicro Technology Co,.Ltd

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The following example is a assembly language program that demostrates STC89xx Series MCU WDT.
;/*------------------------------------------------------------------*/
;/* --- STC MCU International Limited -------------------------------*/
;/* --- STC89xx Series MCU WDT Demo -----------------------*/
;/* If you want to use the program or the program referenced in the */
;/* article, please specify in which data and procedures from STC */
;/*------------------------------------------------------------------*/
; WDT overflow time = (N × Pre-scale × 32768) / SYSclk
;When MCU in 12T mode, N=12. When MCU in 6T mode, N=6
WDT_CONTR
EQU
0E1H
;WDT address
LED
EQU
P1.5
;WDT overflow time LED on P1.5
;The WDT overflow time may be measured by the LED light time
Pre_scale_Word
EQU
0x35
;Start up WDT, Pre-scale value is 64
;SYSclk=18.432, MCU in 12T mode ,WDT overflow time=（12 x 64 x 32768)/18432000 = 1.36 S
ORG
0000H
AJMP
MAIN
ORG
0100H
MAIN:
CLR
LED
;turn LED indicator on
ACALL Delay
;delay about 1s
MOV
WDT_CONTR,
#Pre_scale_Word ;Start up WDT
SETB
LED
;turn off LED
WAIT:
SJMP
WAIT
;wait WDT overflow reset
;LED will be turned on again after reset
Delay:
MOV
R0,
#0
MOV
R1,
#0
MOV
R2,
#15
Delay_Loop:
DJNZ
R0,
Delay_Loop
DJNZ
R1,
Delay_Loop
DJNZ
R2,
Delay_Loop
RET
END
19



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