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Sheet目录3851

53页 54页 55页 56页 [57页]58页 59页 60页 61页

PIC18(L)F2X/4XK22

DS41412F-page 60

2010-2012 Microchip Technology Inc.

4.2

Register Definitions: Reset Control

REGISTER 4-1:

RCON: RESET CONTROL REGISTER

R/W-0/0

R/W-q/u

U-0

R/W-1/q

R-1/q

R/W-q/u

R/W-0/q

IPEN

SBOREN(1)

—RI

POR(2)

BOR

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

‘1’ = Bit is set

‘0’ = Bit is cleared

-n/n = Value at POR and BOR/Value at all other Resets

x = Bit is unknown

u = unchanged

q = depends on condition

bit 7

IPEN: Interrupt Priority Enable bit

= Enable priority levels on interrupts

= Disable priority levels on interrupts (PIC16CXXX Compatibility mode)

bit 6

SBOREN: BOR Software Enable bit(1)

If BOREN<1:0> = 01:

= BOR is enabled

= BOR is disabled

If BOREN<1:0> = 00, 10 or 11:

Bit is disabled and read as ‘0’.

bit 5

Unimplemented: Read as ‘0’

bit 4

RI: RESET Instruction Flag bit

= The RESET instruction was not executed (set by firmware or Power-on Reset)

= The RESET instruction was executed causing a device Reset (must be set in firmware after a

code-executed Reset occurs)

bit 3

TO: Watchdog Time-out Flag bit

= Set by power-up, CLRWDT instruction or SLEEP instruction

= A WDT time-out occurred

bit 2

PD: Power-down Detection Flag bit

= Set by power-up or by the CLRWDT instruction

= Set by execution of the SLEEP instruction

bit 1

POR: Power-on Reset Status bit(2)

= No Power-on Reset 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(3)

= A Brown-out Reset has not occurred (set by firmware only)

= A Brown-out Reset occurred (must be set by firmware after a POR or Brown-out Reset occurs)

Note 1:

When CONFIG2L[2:1] = 01, then the SBOREN Reset state is ‘1’; otherwise, it is ‘0’.

The actual Reset value of POR is determined by the type of device Reset. See the notes following this

register and Section 4.7 “Reset State of Registers” for additional information.

See Table 4-1.

Note 1: Brown-out Reset is indicated when BOR is ‘0’ and POR is ‘1’ (assuming that both POR and BOR were set

to ‘1’ by firmware immediately after POR).

2: It is recommended that the POR bit be set after a Power-on Reset has been detected so that subsequent

Power-on Resets may be detected.

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