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- To use the serial communication with interrupt, we have to set ES bit along with the EA bit.
- Whenever single byte data is sent or received, the serial interrupt is generated and the TI or RI flag of SCON register goes high.
- Here, the TI or RI flag needs to be cleared explicitly in the interrupt routine (written for the Serial Interrupt).
- Registers those are used in programming of serial communication with interrupt are as follow:
TMOD
- G=0 mean, timer control by software mechanism.
- G=1 mean, timer control by hardware mechanism.
- C/T0= 0 mean, timer operation.
- C/T0= 1 mean, counter operation.
|
M1 |
M0 |
MODE OF OPERATION |
|
0 |
0 |
Mode 0 (13 bit) |
|
0 |
1 |
Mode 1 (16bit) |
|
1 |
0 |
Mode (8bit auto reload mode ) |
|
1 |
1 |
Split timer mode |
|
|
|
|
TH1 & TL1
- This is each 8 bit register used to load the value up to which timer run.
- On reaching on this value loaded in TH and TL, timer flag is raised
SCON
- REN=0 mean, receive transmit disable.
- REN=1 mean, receive transmit enable.
- TB8 & RB8 are reserved.
- TI=0 mean, transmission is continue.
- TI=1 mean, transmission is completed.
- RI=0 mean, receiving is continue.
- RI=1 mean. receiving is completed.
|
TCON
- TR1=0 mean, to stop timer 1 .
- TR1=1 mean, to start timer 1.
- TR0=0 mean, to start timer 0.
- TR0=1 mean, to start timer 0.
- TF1=1 mean overflow condition occur in Timer 1.
- TF1=0 mean Timer 1 is in running condition.
- TF0=1 mean overflow condition occur in Timer 0.
- TF0=0 mean Timer 0 is in running condition.
- IT1=1 mean interrupt trigger is negative edge sensitive.
- IT1=0 mean interrupt trigger is positive edge sensitive.
- IT0=1 mean interrupt trigger is negative edge sensitive.
- IT0=0 mean interrupt trigger is positive edge sensitive.
- IE1=1 mean interrupt enable Timer 1.
- IE1=0 mean interrupt enable Timer 1.
- IE0=1 mean interrupt enable Timer 0.
- IE0=0 mean interrupt enable Timer 0.