PIC16C55A-04/P【PDF 139/194 页】IC MCU OTP 512X12 28DIP

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2002 Microchip Technology Inc.

Preliminary

DS30453D-page 47

PIC16C5X

9.3

Power-Down Mode (SLEEP)

A device may be powered down (SLEEP) and later

powered up (Wake-up from SLEEP).

9.3.1

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

(MCLR = VIH).

9.3.2

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.

9.4

Program Verification/Code

Protection

If the code protection bit(s) have not been pro-

grammed, the on-chip program memory can be read

out for verification purposes.

9.5

ID Locations

Four memory locations are designated as ID locations

where the user can store checksum or other code-iden-

tification 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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