參數(shù)資料
型號(hào)： PIC16CR77
廠商： Microchip Technology Inc.
英文描述： 28/40-Pin, 8-Bit CMOS ROM Microcontrollers
中文描述： 28/40-Pin，8位微控制器的CMOS光盤(pán)
文件頁(yè)數(shù)： 104/172頁(yè)
文件大小： 1506K
代理商： PIC16CR77
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PIC16CR7X
DS21993C-page 102
2007 Microchip Technology Inc.
12.14 Power-down Mode (Sleep)
Power-down mode is entered by executing a
SLEEP
instruction.
If enabled, the Watchdog Timer will be cleared but
keeps running, the PD bit (STATUS<3>) is cleared, the
TO (STATUS<4>) bit 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 high-impendance).
For lowest current consumption in this mode, place all
I/O pins at either V
DD
or V
SS
, ensure no external cir-
cuitry is drawing current from the I/O pin, power-down
the A/D and disable external clocks. Pull all I/O pins
that are high-impendance inputs, high or low externally,
to avoid switching currents caused by floating inputs.
The T0CKI input should also be at V
DD
or V
SS
for low-
est current consumption. The contribution from on-chip
pull-ups on PORTB should also be considered.
The MCLR pin must be at a logic high level (V
IHMC
).
12.14.1
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.
Watchdog Timer wake-up (if WDT was
enabled).
3.
Interrupt from INT pin, RB port change or a
Peripheral Interrupt.
External MCLR Reset will cause a device Reset. All
other events are considered a continuation of program
execution and cause a “wake-up”. The TO and PD bits
in the STATUS register can be used to determine the
cause of 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.
The following peripheral interrupts can wake the device
from Sleep:
1.
PSP read or write (PIC16CR74/77 only).
2.
TMR1 interrupt. Timer1 must be operating as an
asynchronous counter.
3.
CCP Capture mode interrupt.
4.
Special event trigger (Timer1 in Asynchronous
mode, using an external clock).
5.
SSP (Start/Stop) bit detect interrupt.
6.
SSP transmit or receive in Slave mode
(SPI/I
2
C).
7.
USART RX or TX (Synchronous Slave mode).
8.
A/D conversion (when A/D clock source is RC).
Other peripherals cannot generate interrupts, since
during Sleep, no on-chip clocks are present.
When 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 execu-
tion of the instruction following
SLEEP
is not desirable,
the user should have a
NOP
after the
SLEEP
instruction.
12.14.2
WAKE-UP USING INTERRUPTS
When global interrupts are disabled (GIE cleared) and
any interrupt source has both its interrupt enable bit
and interrupt flag bit set, one of the following will occur:
If the interrupt occurs
before
the execution of a
SLEEP
instruction, the
SLEEP
instruction will
complete as a
NOP
. Therefore, the WDT and WDT
postscaler will not be cleared, the TO bit will not
be set and PD bits will not be cleared.
If the interrupt occurs
during or after
the execu-
tion of a
SLEEP
instruction, the device will imme-
diately wake-up from Sleep. The
SLEEP
instruction will be completely executed before the
wake-up. Therefore, the WDT and WDT
postscaler will be cleared, the TO bit will be set
and the PD bit will be cleared.
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
.
To ensure that the WDT is cleared, a
CLRWDT
instruction
should be executed before a
SLEEP
instruction.
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