Datasheet

Table Of Contents
PIC16(L)F1508/9
DS40001609C-page 68 2011-2013 Microchip Technology Inc.
6.12 Determining the Cause of a Reset
Upon any Reset, multiple bits in the STATUS and
PCON registers are updated to indicate the cause of
the Reset. Tabl e 6- 3 and Tab le 6 -4 show the Reset
conditions of these registers.
TABLE 6-3: RESET STATUS BITS AND THEIR SIGNIFICANCE
TABLE 6-4: RESET CONDITION FOR SPECIAL REGISTERS
STKOVF STKUNF RWDT RMCLR RI POR BOR TO PD Condition
001110x11Power-on Reset
001110x0xIllegal, TO
is set on POR
001110xx0Illegal, PD is set on POR
00u11u011Brown-out Reset
uu0uuuu0uWDT Reset
uuuuuuu00WDT Wake-up from Sleep
uuuuuuu10Interrupt Wake-up from Sleep
uuu0uuuuuMCLR
Reset during normal operation
uuu0uuu10MCLR
Reset during Sleep
u u u u 0 u u u u RESET Instruction Executed
1uuuuuuuuStack Overflow Reset (STVREN = 1)
u1uuuuuuuStack Underflow Reset (STVREN = 1)
Condition
Program
Counter
STATUS
Register
PCON
Register
Power-on Reset 0000h ---1 1000 00-- 110x
MCLR
Reset during normal operation 0000h ---u uuuu uu-- 0uuu
MCLR Reset during Sleep 0000h ---1 0uuu uu-- 0uuu
WDT Reset 0000h ---0 uuuu uu-- uuuu
WDT Wake-up from Sleep PC + 1 ---0 0uuu uu-- uuuu
Brown-out Reset 0000h ---1 1uuu 00-- 11u0
Interrupt Wake-up from Sleep PC + 1
(1)
---1 0uuu uu-- uuuu
RESET Instruction Executed 0000h ---u uuuu uu-- u0uu
Stack Overflow Reset (STVREN = 1) 0000h ---u uuuu 1u-- uuuu
Stack Underflow Reset (STVREN = 1) 0000h ---u uuuu u1-- uuuu
Legend: u = unchanged, x = unknown, - = unimplemented bit, reads as ‘0’.
Note 1: When the wake-up is due to an interrupt and the Global Interrupt Enable bit (GIE) is set, the return address
is pushed on the stack and PC is loaded with the interrupt vector (0004h) after execution of PC + 1.