PIC18F258-ESLASHSP datasheet(60/402 Pages) MICROCHIP

60 / 402 page

PIC18FXX8

DS41159E-page 58

4.14

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: RESET CONTROL 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 if the brown-

out circuit is disabled (the BOREN config-

uration bit is clear). BOR must then be set

by the user and checked on subsequent

Resets to see if it is clear, indicating 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

R/W-0

IPEN

—

—RI

POR

BOR

bit 7

bit 0

bit 7

IPEN: Interrupt Priority Enable bit

= Enable priority levels on interrupts

= Disable priority levels on interrupts (PIC16CXXX Compatibility mode)

bit 6-5

Unimplemented: Read as ‘0’

bit 4

RI: RESET Instruction Flag bit

= The RESET instruction was not executed

= 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

= After power-up, CLRWDT instruction or SLEEP instruction

= A WDT time-out occurred

bit 2

PD: Power-down Detection Flag bit

= After power-up or by the CLRWDT instruction

= By execution of the SLEEP instruction

bit 1

POR: Power-on Reset Status bit

= A Power-on Reset has not occurred

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

bit 0

BOR: Brown-out Reset Status bit

= A Brown-out Reset has not occurred

= 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

PIC18F258-E/SP 数据表(PDF) 60 Page - Microchip Technology

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