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STC89C53RC датащи(PDF) 96 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) 96 Page - STCmicro Technology Co,.Ltd

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Example: write a program using Timer 1 to create a 500Hz square wave on P1.0.
Assembly Language Solution:
ORG
0030H
MOV
TMOD, #10H
;16-bit timer mode
MOV
TH1,
#0F8H
;-1000 (high byte)
MOV
TH1,
#30H
;-1000 (low byte)
SETB
TR1
;Start Tmier 1
LOOP:
JNB
TF1,
LOOP
;Wait for overflow
CLR
TF1
;Clear Timer overflow flag
CPL
P1.0
;Toggle port bit
SJMP
LOOP
;Repeat
END
C Language Solution :
#include <REG51.H>
/* SFR declarations */
sbit
portbit = P1^0;
/* Use variable portbit to refer to P1.0 */
main( )
{
TMOD = 0x10;
/* timer 1, mode 1, 16-bit timer mode */
while (1)
/* repeat forever */
{
TH1 = 0xF8;
/* -1000 (high byte) */
TL1 = 0x30;
/* -1000 (low byte) */
TR1 = 1;
/* Start timer 1 */
while (TF0 !=1);
/* wait for overflow */
TR1 = 0;
/* stop timer 1 */
TF0 = 0;
/* clear timer overflow flag */
portbit = !(portbit);
/* toggle P1.0 */
}
}
Mode 2
Mode 2 configures the timer register as an 8-bit counter(TL1) with automatic reload. Overflow from TL1 not
only set TFx, but also reload TL1 with the content of TH1, which is preset by software. The reload leaves TH1
unchanged.
Interrupt
SYSclk
TF1
control
C/T=0
C/T=1
T1 Pin
TR1
GATE
INT1
MCU in 12T mode
MCU in 6T mode
TL1
(8 Bits)
TH1
(8 Bits)
Timer/Counter 1 Mode 2: 8-Bit Auto-Reload
÷12
÷6
96



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