CF745 datasheet(42/217 Pages) MICROCHIP

42 / 217 page

PIC16C5X

DS30453B-page 42

Preliminary

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/VPP pin low.

For lowest current consumption while powered down,

the T0CKI input should be at VDD or VSS and the

MCLR/VPP pin must be at a logic high level.

7.9.2

WAKE-UP FROM SLEEP

The device can wake up from SLEEP through one of

the following events:

An external reset input on MCLR/VPP pin.

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

the

code

protection

bit(s)

have

not

been

programmed, the on-chip program memory can be

read out for veriﬁcation purposes.

7.11

ID Locations (not implemented on

PIC16C52)

Four memory locations are designated as ID locations

where the user can store checksum or other

code-identiﬁcation numbers. These locations are not

accessible during normal execution but are readable

and writable during program/verify.

Use only the lower 4 bits of the ID locations and

always program the upper 8 bits as '1's.

Note:

Microchip does not recommend code pro-

tecting windowed devices.

Note:

Microchip will assign a unique pattern

number for QTP and SQTP requests and

for ROM devices. This pattern number will

be unique and traceable to the submitted

code.

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