PIC16LF1824T39A_12 Datasheet, PDF (96/418 Pages) Microchip Technology – 20-Pin Flash Microcontrollers with XLP Technology

PIC16LF1824T39A
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 9-1:
WAKE-UP FROM SLEEP THROUGH INTERRUPT
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1
OSC1⁽¹⁾
CLKOUT⁽²⁾
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
TOST⁽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
Dummy Cycle
0004h
Inst(0004h)
Dummy Cycle
0005h
Inst(0005h)
Inst(0004h)
Note 1:
2:
3:
4:
XT, HS or LP Oscillator mode assumed.
CLKOUT is not available in XT, HS, or LP Oscillator modes, but shown here for timing reference.
TOST = 1024 TOSC (drawing not to scale). This delay applies only to XT, HS or LP Oscillator modes.
GIE = 1 assumed. In this case after wake-up, the processor calls the ISR at 0004h. If GIE = 0, execution will continue in-line.
TABLE 9-1: SUMMARY OF REGISTERS ASSOCIATED WITH POWER-DOWN MODE
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Register on
Page
INTCON
GIE
PEIE
TMR0IE
INTE
IOCIE TMR0IF
INTF
IOCIF
87
IOCAF
—
—
IOCAF5 IOCAF4 IOCAF3 IOCAF2 IOCAF1 IOCAF0
131
IOCAN
—
—
IOCAN5 IOCAN4 IOCAN3 IOCAN2 IOCAN1 IOCAN0
131
IOCAP
—
—
IOCAP5 IOCAP4 IOCAP3 IOCAP2 IOCAP1 IOCAP0
130
PIE1
TMR1GIE ADIE
RCIE
TXIE
SSP1IE CCP1IE TMR2IE TMR1IE
88
PIE2
OSFIE
C2IE
C1IE
EEIE
BCL1IE
—
—
CCP2IE
89
PIR1
TMR1GIF ADIF
RCIF
TXIF
SSP1IF CCP1IF TMR2IF TMR1IF
91
PIR2
OSFIF
C2IF
C1IF
EEIF
BCL1IF
—
—
CCP2IF
92
STATUS
—
—
—
TO
PD
Z
DC
C
18
WDTCON
—
—
WDTPS4 WDTPS3 WDTPS2 WDTPS1 WDTPS0 SWDTEN
99
Legend: — = unimplemented, read as ‘0’. Shaded cells are not used in Power-Down mode.
DS41657A-page 96
Preliminary
 2012 Microchip Technology Inc.