參數(shù)資料
型號： MTA81010S-XTI/SO
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 4 MHz, RISC MICROCONTROLLER, PDSO28
封裝： 0.300 INCH, SOIC-28
文件頁數(shù)： 32/76頁
文件大小： 745K
代理商： MTA81010S-XTI/SO
MTA81010
DS39005D-page 38
1995 Microchip Technology Inc.
13.0
POWER DOWN MODE (SLEEP)
The power down mode is entered by executing a
SLEEP
instruction.
If enabled, the watchdog timer will be cleared but keeps
running, the bit PD in the status register (f3) is cleared,
the TO bit is set, and the oscillator driver is turned off.
The I/O ports maintain the status they had, before the
SLEEP
command was executed (driving high, low, or
hi-impedance).
For lowest current consumption in this mode, all I/O
pins should be either at VDD, or VSS, with no external
circuitry drawing current from the I/O pin. I/O pins that
are in the High-Z mode should be pulled high or low
externally to avoid switching currents caused by
floating inputs. The T0CKI input should also be at VDD
or VSS for lowest current consumption.
The MCLR pin must be at VIHMC.
13.1
Wake-Up
The device can be awakened by a watchdog timer
time-out (if it is enabled) or an externally applied "low"
pulse at the MCLR pin. In both cases the PIC16C54 will
stay in RESET mode for one oscillator start-up timer
period (triggered from rising edge on MCLR or WDT
time-out) before normal program execution resumes.
The PD bit in the STATUS register, which is set to “1”
during power on, but cleared by the SLEEP command,
can be used to determine if the processor was powered
up or if it was awakened from the power down mode
(Figure 3-1). The TO bit in the Status register can be
used to determine if the "wake up" was caused by an
external MCLR signal or a watchdog timer time out.
Note:
Some applications may require external
R/C networks on the MCLR pin in order to
allow for oscillator start-up times longer
than one OST period. In this case, a WDT
wake up from power down mode is not
recommended,
because
a
RESET
generated by a WDT time out does not
discharge the external capacitor, and the
PIC16C54 will be in RESET only for the
oscillator start-up timer period.
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