參數(shù)資料
型號(hào)： 16F84
廠商： Microchip Technology Inc.
英文描述： CAT 5E CROSSOVER, BLUE 15 FT PATCH CABLE
中文描述： 18引腳閃存/ EEPROM的8位微控制器
文件頁(yè)數(shù)： 51/124頁(yè)
文件大?。?/td> 1322K
代理商： 16F84
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PIC16F8X
1998 Microchip Technology Inc.
DS30430C-page 51
8.12
Power-down Mode (SLEEP)
A device may be powered down (SLEEP) and later
powered up (Wake-up from SLEEP).
8.12.1
SLEEP
The Power-down mode is entered by executing the
SLEEP
instruction.
If enabled, the Watchdog Timer is cleared (but keeps
running), the PD bit (STATUS<3>) is cleared, the TO bit
(STATUS<4>) is set, and the oscillator driver is turned
off. The I/O ports maintain the status they had before
the
SLEEP
instruction was executed (driving high, low,
or hi-impedance).
For the lowest current consumption in SLEEP mode,
place all I/O pins at either at V
DD
or V
SS
, with no
external circuitry drawing current from the I/O pins, and
disable external clocks. I/O pins that are hi-impedance
inputs should be pulled high or low externally to avoid
switching currents caused by floating inputs. The
T0CKI input should also be at V
DD
or V
SS
. The
contribution from on-chip pull-ups on PORTB should be
considered.
The MCLR pin must be at a logic high level (V
IHMC
).
It should be noted that a RESET generated by a WDT
time-out does not drive the MCLR pin low.
8.12.2
WAKE-UP FROM SLEEP
The device can wake-up from SLEEP through one of
the following events:
1.
External reset input on MCLR pin.
2.
WDT Wake-up (if WDT was enabled).
3.
Interrupt from RB0/INT pin, RB port change, or
data EEPROM write complete.
Peripherals cannot generate interrupts during SLEEP,
since no on-chip Q clocks are present.
The first event (MCLR reset) will cause a device reset.
The two latter events are considered a continuation of
program execution. The TO and PD bits can be used to
determine the cause of a device reset. The PD bit,
which is set on power-up, is cleared when SLEEP is
invoked. The TO bit is cleared if a WDT time-out
occurred (and caused wake-up).
While the
SLEEP
instruction is being executed, the next
instruction (PC + 1) is pre-fetched. For the device to
wake-up through an interrupt event, the corresponding
interrupt enable bit must be set (enabled). Wake-up
occurs regardless of the state of the GIE bit. If the GIE
bit is clear (disabled), the device continues execution at
the instruction after the
SLEEP
instruction. If the GIE bit
is set (enabled), the device executes the instruction
after the
SLEEP
instruction and then branches to the
interrupt address (0004h). In cases where the
execution of the instruction following
SLEEP
is not
desirable, the user should have a
NOP
after the
SLEEP
instruction.
FIGURE 8-19: WAKE-UP FROM SLEEP THROUGH INTERRUPT
Q1
Q2
Q3 Q4
Q1 Q2
Q3
Q4
Q1
Q1
Q2 Q3 Q4
Q1 Q2 Q3 Q4
Q1
Q2 Q3
Q4
Q1 Q2
Q3
Q4
OSC1
CLKOUT(4)
INT pin
INTF flag
GIE bit
INSTRUCTION FLOW
PC
Instruction
Instruction
PC
PC+1
PC+2
Inst(PC) = SLEEP
Inst(PC - 1)
Inst(PC + 1)
SLEEP
Processor in
SLEEP
Interrupt Latency
(Note 2)
Inst(PC + 2)
Inst(PC + 1)
Inst(0004h)
Inst(0005h)
Inst(0004h)
Dummy cycle
PC + 2
0004h
0005h
Dummy cycle
T
OST
(2)
PC+2
Note
1: XT, HS or LP oscillator mode assumed.
2: T
OST
= 1024T
OSC
(drawing not to scale) This delay will not be there for RC osc mode.
3: GIE = '1' assumed. In this case after wake- up, the processor jumps to the interrupt routine. If GIE = '0', execution will continue in-line.
4: CLKOUT is not available in these osc modes, but shown here for timing reference.
相關(guān)PDF資料
PDF描述
16F84A CAT 5E CROSSOVER PATCH CORD CABLE BLUE 20 FT
16F871 CAT 5E CROSSOVER PATCH CORD CABLE GREEN 6 FT
16F872 CAT 5E CROSSOVER PATCH CORD CABLE GREEN 10 FT
16F876A 28/40-pin Enhanced FLASH Microcontrollers
16F876 CAT 5E CROSSOVER, GREEN 15 FT PATCH CABLE
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
16F84A 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:18-pin Enhanced Flash/EEPROM 8-Bit Microcontroller
16F870 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:28/40-Pin 8-Bit CMOS FLASH Microcontrollers
16F871 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:28/40-Pin 8-Bit CMOS FLASH Microcontrollers
16F872 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:28-Pin, 8-Bit CMOS FLASH Microcontroller
16F876 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:28/40-pin 8-Bit CMOS FLASH Microcontrollers
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