參數(shù)資料
型號: pic16cr54c
廠商: Microchip Technology Inc.
英文描述: ROM-Based 8-Bit CMOS Microcontroller Series(8位CMOS微控制器)
中文描述: 基于ROM的8位CMOS微控制器系列(8位的CMOS微控制器)
文件頁數(shù): 35/84頁
文件大?。?/td> 654K
代理商: PIC16CR54C
1998 Microchip Technology Inc.
Preliminary
DS40191A-page 35
PIC16CR54C
7.9
Power-Down Mode (SLEEP)
A device may be powered down (SLEEP) and later
powered up (Wake-up from SLEEP).
7.9.1
SLEEP
The Power-Down mode is entered by executing a
SLEEP
instruction.
If enabled, the Watchdog Timer will be cleared but
keeps running, the TO bit (STATUS<4>) is set, the PD
bit (STATUS<3>) is cleared and the oscillator driver is
turned off. The I/O ports maintain the status they had
before the
SLEEP
instruction was executed (driving
high, driving low, or hi-impedance).
It should be noted that a RESET generated by a WDT
time-out does not drive the MCLR/V
PP
pin low.
For lowest current consumption while powered down,
the T0CKI input should be at V
DD
or V
SS
and the
MCLR/V
PP
pin must be at a logic high level
(V
IH
MCLR).
7.9.2
WAKE-UP FROM SLEEP
The device can wake up from SLEEP through one of
the following events:
1.
An external reset input on MCLR/V
PP
pin.
2.
A Watchdog Timer time-out reset (if WDT was
enabled).
Both of these events cause a device reset. The TO and
PD bits can be used to determine the cause of device
reset. The TO bit is cleared if a WDT time-out
occurred (and caused wake-up). The PD bit, which is
set on power-up, is cleared when
SLEEP
is invoked.
The WDT is cleared when the device wakes from
sleep, regardless of the wake-up source.
7.10
Program Verification/Code Protection
If the code protection bit(s) have not been
programmed, the on-chip program memory can be
read out for verification purposes.
Note:
Microchip does not recommend code pro-
tecting windowed devices.
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