PIC16LF1938-ESP View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16LF1938-ESP

28/40/44-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver and nanoWatt XLP™ Technology

Microchip Technology 

PIC16F193X/LF193X

3.9 Power Control (PCON) Register

The Power Control (PCON) register has six Status bits

to indicate what type of Reset that last occurred.

3.9.1 PCON REGISTER

The Power Control (PCON) register contains flag bits

(refer to Table 3-6) to differentiate between a:

• Power-on Reset (POR)

• Brown-out Reset (BOR)

• Reset Instruction Reset (RI)

• Stack Overflow Reset (STKOVF)

• Stack Underflow Reset (STKUVF)

The PCON register also controls the software enable of

the BOR.

The PCON register bits are shown in Register 3-3.

REGISTER 3-3: PCON: POWER CONTROL REGISTER

R/W-0/q

R/W-0/q

U-0

STKOVF

STKUNF

—

bit 7

U-0

R/W-1/q

—

RMCLR

R/W-1/q

RI

R/W-q/u

POR

R/W-q/u

BOR

bit 0

Legend:

R = Readable bit

u = bit is unchanged

‘1’ = Bit is set

W = Writable bit

x = Bit is unknown

‘0’ = Bit is cleared

U = Unimplemented bit, read as ‘0’

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

q = Value depends on condition

bit 7

bit 6

bit 5-4

bit 3

bit 2

bit 1

bit 0

STKOVF: Stack Overflow Flag bit

1 = A Stack Overflow occurred (more CALLs than fit on the stack)

0 = A Stack Overflow has not occurred or set to ‘0’ by firmware

STKUNF: Stack Underflow Flag bit

1 = A Stack Underflow occurred (more RETURNs than CALLs)

0 = A Stack Underflow has not occurred or set to ‘0’ by firmware

Unimplemented: Read as ‘0’

RMCLR: MCLR Reset Flag bit

1 = A MCLR Reset has not occurred or set to ‘1’ by firmware

0 = A MCLR Reset has occurred (set to ‘0’ in hardware when a MCLR Reset occurs)

RI: RESET Instruction Flag bit

1 = A RESET instruction has not been executed or set to ‘1’ by firmware

0 = A RESET instruction has been executed (set to ‘0’ in hardware upon executing a RESET instruction)

POR: Power-on Reset Status bit

1 = No Power-on Reset occurred

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

BOR: Brown-out Reset Status bit

1 = No Brown-out Reset occurred

0 = A Brown-out Reset occurred (must be set in software after a Power-on Reset or Brown-out Reset

occurs)

© 2009 Microchip Technology Inc.

Preliminary

DS41364B-page 65

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