PIC16LF1507 Datasheet, PDF (76/266 Pages) Microchip Technology – 20-Pin Flash, 8-Bit Microcontrollers

PIC16(L)F1507
Even if the flag bits were checked before executing a
SLEEP instruction, it may be possible for flag bits to
become set before the SLEEP instruction completes. To
determine whether a SLEEP instruction executed, test
the PD bit. If the PD bit is set, the SLEEP instruction
was executed as a NOP.
FIGURE 8-1:
WAKE-UP FROM SLEEP THROUGH INTERRUPT
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1
CLKIN⁽¹⁾
CLKOUT⁽²⁾
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
T1OSC⁽³⁾
Interrupt flag
GIE bit
(INTCON reg.)
Instruction Flow
PC
PC
Instruction
Fetched
Inst(PC) = Sleep
Instruction
Executed
Inst(PC - 1)
Processor in
Sleep
PC + 1
Inst(PC + 1)
Sleep
PC + 2
Interrupt Latency⁽⁴⁾
PC + 2
Inst(PC + 2)
Inst(PC + 1)
PC + 2
Forced NOP
0004h
Inst(0004h)
Forced NOP
0005h
Inst(0005h)
Inst(0004h)
Note 1:
2:
3:
4:
External clock. High, Medium, Low mode assumed.
CLKOUT is shown here for timing reference.
T1OSC; See Section 25.0 “Electrical Specifications”.
GIE = 1 assumed. In this case after wake-up, the processor calls the ISR at 0004h. If GIE = 0, execution will continue in-line.
 2011 Microchip Technology Inc.
Preliminary
DS41586A-page 76