| ??? 04/25/06 06:17 Modified: 04/25/06 06:19 Read: times Msg Score: +1 +1 Good Answer/Helpful |
#114972 - interrupt duration Responding to: ???'s previous message |
hi,
Dileep Shenoy said:
the int0 was enabled using EX0, EA and configured as edge sensitive. but once the uC goes into power
down , it doent respond at all( except for reset).Have i missed any thing? Yes, you did. First of all, the interrupt must be configured as level sensitive and secondary, its duration must be enough to stabilize oscillator (approx. 10ms). Here is from Atmel: There are two ways to exit the Power-Down mode:
1. Generate an enabled external interrupt using INT0#, INT1#. Hardware clears PD bit in PCON register which starts the oscillator and restores the clocks to the CPU and peripherals. Using INTx# input, execution resumes when the input is released (see Figure 19). Execution resumes with the interrupt service routine. Upon completion of the interrupt service routine, program execution resumes with the instruction immediately following the instruction that activated Power-Down mode. Note: The external interrupt used to exit Power-Down mode must be configured as level sensitive (INT0# and INT1#) and must be assigned the highest priority. In addition, the duration of the interrupt must be long enough to allow the oscillator to stabilize. The execution will only resume when the interrupt is deasserted. Regards, Oleg |
| Topic | Author | Date |
| 89s52-exit from power down using INT0 | 01/01/70 00:00 | |
| Why power down? | 01/01/70 00:00 | |
| why power down | 01/01/70 00:00 | |
| Yes, but... | 01/01/70 00:00 | |
yes, but | 01/01/70 00:00 | |
| interrupt duration | 01/01/70 00:00 | |
| interrupt duration | 01/01/70 00:00 | |
| exit from interrupts | 01/01/70 00:00 |