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Since one interrupt bit is used for both Transfer Interrupt (TI) and Receiver Interrupt (RI) flags, Interrupt Service Routine (ISR) must examine these flags for knowing the actual interrupt.īy the logical OR operation of RI and TI flags causes the interrupt and it is clear by the software alone.Ĭonsider the steps involved in serial communication interrupt programming are:. Serial Communication Interrupt Programming It is used when there is a need to send or receive data.IT0 = 1 // Configure interrupt 0 for falling edge on INT0ĮA =1 // Enabling the global interrupt flag
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If it is level triggering, then write subroutine appropriate to this interrupt, or else enable the bit in TCON register corresponding to the edge triggered interrupt.Ĭonsider the edge triggered external hardware interrupt programming is:.Enables the equivalent bit of external interrupt in Interrupt Enable (IE) register.Let us see the programmable feature of 8051 microcontroller are: In level triggering, low signal at pin 3.2 enables the interrupt, while at pin 3.2 high to low transition enables the edge triggered interrupt. It can be level triggered or edge triggered. These interrupts are enabled at pin 3.2 and pin 3.3. Microcontroller 8051 is consisting of two external hardware interrupts: INT0 and INT1 as discussed above. External Hardware Interrupt Programming.TH0 = 0xFC: // initial value is loaded to timer TH0=0xFC // loading initial values to timer 1 for Timer0īlink Led=~Blink Led // Blink LED on interrupt Void timer0_ISR (void) interrupt 1 //interrupt no. Sbit Blink Led = P2^0 // LED is connected to port 2 Zeroth pin Let's see the timer interrupt programming using Timer0 model for blinking LED using interrupt method: Write the subroutine for a timer and clears the value of TRx at the end of the subroutine.Set the timer run bit for starting the timer.Choose and load the initial values of TLx and THx by using appropriate mode of operation.Enables the IE registers and corresponding timer bits in it.Selecting the configuration of TMOD register and their mode of operation.
SIMPLE DELAY FUNCTION FOR 8051 IN C CODE
This timer interrupts programming by C code involves: