Examples of Timer I used without I2C on
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;****************************************************************************
; Timer I Fixed Rate Timer Usage
; This program demonstrates how to activate Timer I on the 83C751 or
; 83C752 microcontrollers as a fixed rate timer when the I2C port is not
; used. Once activated, Timer I will generate an interrupt every 1024
; machine cycles. The I2C bus pins SCL and SDA may be used as open drain
; outputs.
;****************************************************************************
$MOD751
$Title(Timer I Fixed Rate Timer)
$Date(07/14/89)
Flags DATA 20h ;Flag byte
TstFlag BIT Flags.0 ;Timer I flag.
ORG 0
AJMP Reset
ORG 1Bh ;Timer I interrupt.
TimerI: SETB TstFlag ;Set flag to indicate a Timer I interrupt.
SETB CLRTI ;Clear Timer I to allow it to restart.
RETI
Reset: SETB ETI ;Enable Timer I interrupt.
SETB EA ;Enable global interrupts.
SETB TIRUN ;Start Timer I.
Loop: CLR TstFlag ;Initialize interrupt flag.
Wait: JNB TstFlag,Wait ;Wait for Timer I interrupt.
SJMP Loop
END
