Datasheet

 2011 Microchip Technology Inc. Preliminary DS41586A-page 64
PIC16(L)F1507
FIGURE 7-3: INT PIN INTERRUPT TIMING
Q2Q1 Q3 Q4 Q2Q1 Q3 Q4 Q2Q1 Q3 Q4 Q2Q1 Q3 Q4 Q2Q1 Q3 Q4
FOSC
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 TCY. Synchronous latency = 3-4 TCY, where TCY = 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 25.0 “Electrical Specifications””.
4: INTF is enabled to be set any time during the Q4-Q1 cycles.
(1)
(2)
(3)
(4)
(1)