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2011-2015 Microchip Technology Inc.
DS40001609E-page 73
PIC16(L)F1508/9
FIGURE 7-3:
INT PIN INTERRUPT TIMING
Q2
Q1
Q3 Q4
Q2
Q1
Q3 Q4
Q2
Q1
Q3 Q4
Q2
Q1
Q3 Q4
Q2
Q1
Q3 Q4
F
OSC
CLKOUT
INT pin
INTF
GIE
INSTRUCTION FLOW
PC
Instruction
Fetched
Instruction
Executed
Interrupt Latency
PC
PC + 1
PC + 1
0004h
0005h
Inst (0004h)
Inst (0005h)
Forced
NOP
Inst (PC)
Inst (PC + 1)
Inst (PC – 1)
Inst (0004h)
Forced
NOP
Inst (PC)
—
Note 1:
INTF flag is sampled here (every Q1).
2:
Asynchronous interrupt latency = 3-5 T
CY
. Synchronous latency = 3-4 T
CY
, where T
CY
= instruction cycle time.
Latency is the same whether Inst (PC) is a single cycle or a 2-cycle instruction.
3:
For minimum width of INT pulse, refer to AC specifications in
Section 29.0 “Electrical Specifications”
.
4:
INTF is enabled to be set any time during the Q4-Q1 cycles.
(1)
(2)
(3)
(4)
(1)
Содержание PIC12F1501
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