PIC16F570 datasheet(42/134 Pages) MICROCHIP

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PIC16F527

DS40001652C-page 42

 2012-2014 Microchip Technology Inc.

8.4

Reset

The device differentiates between various kinds of

Reset:

• Power-on Reset (POR)

• Brown-out Reset (BOR)

•MCLR Reset during normal operation

•MCLR Reset during Sleep

• WDT Time-out Reset during normal operation

• WDT Time-out Reset during Sleep

• Wake-up from Sleep on pin change

Some registers are not reset in any way, they are

unknown on POR/BOR and unchanged in any other

Reset. Most other registers are reset to “Reset state”

on Power-on Reset (POR)/Brown-out Reset (BOR),

MCLR, WDT or Wake-up on pin change Reset during

normal operation. They are not affected by a WDT

Reset during Sleep or MCLR Reset during Sleep, since

these Resets are viewed as resumption of normal oper-

ation. The exceptions to this are the TO and PD bits.

They are set or cleared differently in different Reset sit-

uations. These bits are used in software to determine

the nature of Reset. See Table 4-1 for a full description

of Reset states of all registers.

TABLE 8-3:

RESET CONDITION FOR SPECIAL REGISTERS

STATUS Addr: 03h

Power-on Reset (POR) or Brown-out Reset (BOR)

0001 1xxx

MCLR Reset during normal operation

000u uuuu

MCLR Reset during Sleep

0001 0uuu

WDT Reset during Sleep

0000 0uuu

WDT Reset normal operation

0000 uuuu

Wake-up from Sleep on pin change

1001 0uuu

Wake-up from Sleep on comparator change

0101 0uuu

Legend: u = unchanged, x = unknown, – = unimplemented bit, read as ‘0’.

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