| ??? 04/17/08 06:43 Read: times |
#153587 - Actually Responding to: ???'s previous message |
Aravinda Abeygunawardane said:
if you want to exit from interrupt 1 routine you have to use RETI instruction in that routine not on the INT 0 routine. Actually both the INT0 and the INT1 routines need to end with a RETI. In fact, every Interrupt Service Routine (ISR) needs to end with a RETI - as that's what clears the hardware's interrupt state! 80C51 family programmer’s guide and instruction set manual said:
RETI
Function: Return from interrupt Description: RETI pops the high- and low-order bytes of the PC successively from the stack, and restores the interrupt logic to accept additional interrupts... It's all in the so-called "bible" for the 8051: Chapter 1 - 80C51 Family Architecture: http://www.nxp.com/acrobat_d...ARCH_1.pdf Chapter 2 - 80C51 Family Programmer's Guide and Instruction Set: http://www.nxp.com/acrobat_d...UIDE_1.pdf Chapter 3 - 80C51 Family Hardware Description: http://www.nxp.com/acrobat_d...WARE_1.pdf Here are some other introductory & reference materials: http://www.keil.com/books/8051books.asp http://www.8052.com/books.phtml http://www.8052.com/tutorial.phtml |
| Topic | Author | Date |
| Problems in interrupts | 01/01/70 00:00 | |
| Need more information | 01/01/70 00:00 | |
| questions | 01/01/70 00:00 | |
| this may be the clue | 01/01/70 00:00 | |
| Actually | 01/01/70 00:00 | |
| Somewhat OT, but what the minimum debounce time | 01/01/70 00:00 | |
Depends on the switch - not the micro | 01/01/70 00:00 |