PIC16LC771 datasheet(21/224 Pages) MICROCHIP

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DS41120C-page 21

PIC16C717/770/771

2.2.2.8

PCON REGISTER

The Power Control (PCON) register contains a flag bit

to allow differentiation between a Power-on Reset

(POR) to an external MCLR Reset or WDT Reset.

Those devices with brown-out detection circuitry con-

tain an additional bit to differentiate a Brown-out Reset

condition from a Power-on Reset condition.

The PCON register also contains the frequency select

bit of the INTRC or ER oscillator.

POWER CONTROL REGISTER (PCON: 8Eh)

Note:

BOR is unknown on Power-on Reset. It

must then be set by the user and checked

on subsequent RESETS to see if BOR is

clear, indicating a brown-out has occurred.

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

not necessarily predictable if the brown-out

circuit is disabled (by clearing the BODEN

bit in the Configuration word).

U-0

R/W-1

U-0

R/W-q

—

—OSCF

—POR

BOR

bit 7

bit 0

bit 7-4

Unimplemented: Read as '0'

bit 3

OSCF: Oscillator Speed bit

INTRC Mode

= 4 MHz nominal

= 37 kHz nominal

ER Mode

= Oscillator frequency depends on the external resistor value on the OSC1 pin.

= 37 kHz nominal

All other modes

= Ignored

bit 2

Unimplemented: Read as '0'

bit 1

POR: Power-on Reset Status bit

= 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 (See Section 2.2.2.8 Note)

= No Brown-out Reset occurred

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

Legend:

q = Value depends on conditions

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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