XC886/888CLM
Interrupt System
User’s Manual
5-16
V1.3, 2010-02
Interrupt System, V 1.0
Figure 5-10
Interrupt Response Time for Condition 2
Figure 5-11
Interrupt Response Time for Condition 3
Thus in a single interrupt system, the response time is between three machine cycles
and less than nine machine cycles if wait states are not considered. When considering
wait states, the interrupt response time will be extended depending on the user
instructions (except the hardware generated LCALL) being executed during the interrupt
response time (shaded region in
Interrupt
request
sampled active
4-cycle current instruction
(MUL or DIV)
Interrupt
request
sampled
LCALL
1
st
instruction at
interrupt vector
Interrupt
request
polled
(last cycle of
current
instruction)
P2
P1
P2
P1
P2
P1
P2
P1
P2
P1
f
CCLK
P2
P1
P2
P1
P2
P1
Interrupt response time = 6 x machine cycle
Interrupt
request
sampled active
2-cycle current instruction
Interrupt
request
sampled
4-cycle next instruction
(MUL or DIV)
LCALL
1
st
instruction at
interrupt vector
Interrupt response time = 8 x machine cycle
P2
P1
P2
P1
P2
P1
P2
P1
P2
P1
P2
P1
P2
P1
P2
P1
P2
P1
P2
P1
f
CCLK
Interrupt
request
sampled
Interrupt request
polled
(last cycle of
current
instruction)
Interrupt request
polled
(RETI or write
access to interrupt
registers)
*
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