Rabbit 6000 User’s Manual
digi.com
87
7. E
XTERNAL
I
NTERRUPTS
7.1 Overview
The Rabbit 6000 has eight external interrupt vectors. Interrupts 0 and 1 can share up to three pins each, and
interrupts 2–7 each only have one pin, providing a total of up to 12 external interrupt inputs out of 22 pos-
sible pins. In the case of multiple interrupts sharing an interrupt vector for interrupts 0 or 1, the data regis-
ter corresponding to the parallel port(s) being used can be read. Each interrupt vector can be set to trigger
on a rising edge, a falling edge, or both edges.
The signal on the external interrupt pin must be present for at least three peripheral clock cycles to be
detected. In addition, the Rabbit 6000 has a minimum latency of 11 clocks to respond to an interrupt, so
the minimum external interrupt response time is three peripheral clock cycles plus 11 processor clock
cycles. Note that this just gets the program to the ISR jump table. An additional 5 or 7 clocks is required
for the jp (jump) instruction plus whatever remaining clocks need to executed in the “current” instruction.
Summary of Contents for 6000
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