PIC16F526-ISLASHP datasheet(56/122 Pages) MICROCHIP

56 / 122 page

PIC16F526

DS41326D-page 56

 2010 Microchip Technology Inc.

8.9

Power-down Mode (Sleep)

A device may be powered down (Sleep) and later

powered up (wake-up from Sleep).

8.9.1

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 of the STATUS register is set,

the PD bit of the STATUS register is cleared and the

oscillator driver is turned off. The I/O ports maintain the

status they had before the SLEEP instruction was exe-

cuted (driving high, driving low or high-impedance).

For lowest current consumption while powered down,

the T0CKI input should be at VDD or VSS and the RB3/

MCLR/VPP pin must be at a logic high level if MCLR is

enabled.

8.9.2

WAKE-UP FROM SLEEP

The device can wake-up from Sleep through one of

the following events:

An external Reset input on RB3/MCLR/VPP pin,

when configured as MCLR.

A Watchdog Timer Time-out Reset (if WDT was

enabled).

A change on input pin RB0, RB1, RB3 or RB4

when wake-up on change is enabled.

A change in one of the comparator output bits,

C1OUT or C2OUT (if comparator wake-up is

enabled).

These events cause a device Reset. The TO, PD and

CWUF/RBWUF 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 CWUF bit indicates a change in a com-

parator output state while the device was in Sleep. The

RBWUF bit indicates a change in state while in Sleep

at pins RB0, RB1, RB3 or RB4 (since the last file or bit

operation on RB port).

The WDT is cleared when the device wakes from

Sleep, regardless of the wake-up source.

Note:

A Reset generated by a WDT time-out

does not drive the MCLR pin low.

Note:

Caution: Right before entering Sleep,

read the input pins. When in Sleep,

wake-up occurs when the values at the

pins change from the state they were in at

the last reading. If a wake-up on change

occurs and the pins are not read before

re-entering Sleep, a wake-up will occur

immediately even if no pins change while

in Sleep mode.

Note:

Caution: Right before entering Sleep,

read

the

comparator

Configuration

When in Sleep, wake-up occurs when the

comparator output bit C1OUT and C2OUT

change from the state they were in at the

last reading. If a wake-up on comparator

change occurs and the pins are not read

before re-entering Sleep, a wake-up will

occur immediately, even if no pins change

while in Sleep mode.

PIC16F526-I/P Datenblatt(PDF) 56 Page - Microchip Technology

PIC16F526-I/P Datenblatt(HTML) 56 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datenblatt Download

Link URL