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what bout time delay
the idea of fashioning an INTA\ signal is cool
i think we would need 8259 to supply the type no of the interrupt to the microcontroller which will execute the appropriate ISR after recognising the type no and priority will also be taken care of
but what bout the time...
some doubts
thank u miguel but i have some doubts
first is that when we are using a dc supply how do we get time for half cycle or zero crossing
by power failure i mean the dc supply of 5 volts or so drops to zero like it does when switched off and the requirement is that b4 it falls to zero...
just providing info bout the abbreviations
INT 0 - external hardware interrupt 0
INT 1 - external hardware interrupt 1
INTA(bar) - interrupt acknowledge and bar signifies active low signal
can anyone pls give information about how to sense a power failure within nanoseconds so as to interrupt the microcontroller using the sensor and so that the microcontroller can activate a backup battery supply through the corresponding interrupt service routine so that the microcontroller makes...
8051 and 8259 aint compatible....i think
8259 needs an INTA(bar) signal which microprocessors like 8085/86 provide but 8051 doesnt.(is there any other microcontroller which provides INTA(bar))
ORing the interrupts is not an option since we need priority handling too.
bout the suggestion of...
i need info about a microcontroller or pic which can handle about 15-20 hardware interrupts (want to avoid software polling)
if the chip has an interrupt controller (like 8259 for 8085/86) then that might help too
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