PIC18LC658T-ESLASHCL datasheet(64/366 Pages) MICROCHIP

64 / 366 page

PIC18CXX8

DS30475A-page 64

Advanced Information

 2000 Microchip Technology Inc.

4.13.1

RCON REGISTER

The Reset Control (RCON) register contains flag bits

that allow differentiation between the sources of a

device RESET. These flags include the TO, PD, POR,

BOR and RI bits. This register is readable and writable.

RCON REGISTER

Note 1: If the BOREN configuration bit is set, BOR

is ’1’ on Power-on Reset. If the BOREN

configuration bit is clear, BOR is unknown

on Power-on Reset.

The BOR status bit is a “don't care” and is

not

necessarily

predictable

the

brown-out circuit is disabled (the BOREN

configuration bit is clear). BOR must then

be set by the user and checked on subse-

quent RESETs to see if it is clear, indicat-

ing a brown-out has occurred.

2: It is recommended that the POR bit be set

after

Power-on

Reset

has

been

detected, so that subsequent Power-on

Resets may be detected.

R/W-0

U-0

R/W-1

R/W-0

IPEN

LWRT

—

POR

BOR

bit 7

bit 0

bit 7

IPEN: Interrupt Priority Enable bit

1 =

Enable priority levels on interrupts

0 =

Disable priority levels on interrupts (16CXXX compatibility mode)

bit 6

LWRT: Long Write Enable bit

1 =

Enable TBLWT to internal program memory

Once this bit is set, it can only be cleared by a POR or MCLR Reset

0 =

Disable TBLWT to internal program memory; TBLWT only to external program memory

bit 5

Unimplemented: Read as '0'

bit 4

RI: RESET Instruction Flag bit

1 =

The RESET instruction was not executed

0 =

The RESET instruction was executed causing a device RESET

(must be set in software after a Brown-out Reset occurs)

bit 3

TO: Watchdog Time-out Flag bit

1 =

After power-up, CLRWDT instruction, or SLEEP instruction

0 =

A WDT time-out occurred

bit 2

PD: Power-down Detection Flag bit

1 =

After power-up or by the CLRWDT instruction

0 =

By execution of the SLEEP instruction

bit 1

POR: Power-on Reset Status bit

1 =

A Power-on Reset has not occurred

0 =

A Power-on Reset occurred

(must be set in software after a Power-on Reset occurs)

bit 0

BOR: Brown-out Reset Status bit

1 =

A Brown-out Reset has not occurred

0 =

A Brown-out Reset occurred

(must be set in software after a Brown-out Reset occurs)

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

- n = Value at POR

’1’ = Bit is set

’0’ = Bit is cleared

x = Bit is unknown

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