Datasheet

 2002 Microchip Technology Inc. DS30325B-page 95
PIC16F7X
12.10 Power Control/Status Register
(PCON)
The Power Control/Status Register, PCON, has two
bits to indicate the type of RESET that last occurred.
Bit0 is Brown-out Reset Status bit, BOR
. Bit BOR is
unknown on a Power-on Reset. It must then be set by
the user and checked on subsequent RESETS to see
if bit BOR
cleared, indicating a Brown-out Reset
occurred. When the Brown-out Reset is disabled, the
state of the BOR
bit is unpredictable.
Bit1 is POR
(Power-on Reset Status bit). It is cleared on
a Power-on Reset and unaffected otherwise. The user
must set this bit following a Power-on Reset.
TABLE 12-3: TIME-OUT IN VARIOUS SITUATIONS
TABLE 12-4: STATUS BITS AND THEIR SIGNIFICANCE
TABLE 12-5: RESET CONDITION FOR SPECIAL REGISTERS
Oscillator Configuration
Power-up
Brown-out
Wake-up from
SLEEP
PWRTE
= 0 PWRTE = 1
XT, HS, LP 72 ms + 1024 T
OSC 1024 TOSC 72 ms + 1024 TOSC 1024 TOSC
RC 72 ms — 72 ms —
POR
(PCON<1>)
BOR
(PCON<0>)
TO
(STATUS<4>)
PD
(STATUS<3>)
Significance
0x 1 1Power-on Reset
0x 0 xIllegal, TO
is set on POR
0x x 0Illegal, PD is set on POR
10 1 1Brown-out Reset
11 0 1WDT Reset
11 0 0WDT Wake-up
11 u uMCLR
Reset during normal operation
11 1 0MCLR Reset during SLEEP or interrupt wake-up from
SLEEP
Condition
Program
Counter
STATUS
Register
PCON
Register
Power-on Reset 000h 0001 1xxx ---- --0x
MCLR
Reset during normal operation 000h 000u uuuu ---- --uu
MCLR
Reset during SLEEP 000h 0001 0uuu ---- --uu
WDT Reset 000h 0000 1uuu ---- --uu
WDT Wake-up PC + 1 uuu0 0uuu ---- --uu
Brown-out Reset 000h 0001 1uuu ---- --u0
Interrupt wake-up from SLEEP PC + 1
(1)
uuu1 0uuu ---- --uu
Legend: u = unchanged, x = unknown, - = unimplemented bit, read as '0'
Note 1: When the wake-up is due to an interrupt and the GIE bit is set, the PC is loaded with the interrupt vector
(0004h).