STC89LE53RC datasheet(100/165 Pages) STC

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

;

ORL

AUXR, #01000000B

;Use Timer 1 in 1T mode

ANL

AUXR, #10111111B

;Use Timer 1 in 12T mode

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

SETB

; Start up Timer 1

SETB

RET

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

;Portal parameter: A= the byte to send

Send_One_Byte:

;Send one byte

CLR

;Clear serial port transmit interrupt flag

MOV

SBUF,

Wait_Send_Finish:

JNB

TI,

Wait_Send_Finish

;Wait to finish send

CLR

SETB

RET

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

END

7.3 Timer/Counter 2 Mode of Operation

Timer 2 is a 16-bit timer/counter which can operate as either an event timer or an event counter as selected by

C/T2 in the special function register T2CON. Timer 2 has four operation modes: Capture Mode, Auto-Reload

Mode (up or down counting), Baud-Rate Generator Mode and Programable Clock-Out Mode, which are selected

by bits T2CON and T2MOD as shown in following table.

Timer 2 Operating Modes Table

RCLK+TCLK CP/RL2 TR2

Mode

16-bit auto-reload

16-bit capture

buad rate generator

(off)

Capture Mode

In the capture mode there are two options selected by bit EXEN2 in T2CON. If EXEN2=0, Timer 2 is a 16-bit

timer or counter which upon overflowing sets bit TF2 (Timer 2 overflow flag). This bit can then be used to

generate an interrupt (by enabling the Timer 2 interrupt bit in the IE register). If EXEN2=1, Timer 2 still does the

above, but with the added feature that a 1-to-0 transition at external input T2EX causes the current value in the

Timer 2 registers, TH2 and TL2, to be captured into registers RCAP2H and RCAP2L, respectively. In addition,

the transition at T2EX causes bit EXF2 in T2CON to be set, and the EXF2 bit, like TF2, can generate an interrupt

which vectors to the same location as Timer 2 overflow interrupt. TF2 and EXF2 is ORed to request the interrupt

service. The capture mode is illustrated in following figure.

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