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PIC18F85J90 데이터시트(PDF) 56 Page - Microchip Technology

부품명 PIC18F85J90
상세설명  64/80-Pin, High-Performance Microcontrollers with LCD Driver and nanoWatt Technology
PDF  416 Pages
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제조업체  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC18F85J90 데이터시트(HTML) 56 Page - Microchip Technology

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PIC18F85J90 FAMILY
DS39770C-page 56
 2010 Microchip Technology Inc.
5.7
Reset State of Registers
Most registers are unaffected by a Reset. Their status
is unknown on POR and unchanged by all other
Resets. The other registers are forced to a “Reset
state” depending on the type of Reset that occurred.
Most registers are not affected by a WDT wake-up,
since this is viewed as the resumption of normal
operation. Status bits from the RCON register, CM, RI,
TO, PD, POR and BOR, are set or cleared differently in
different Reset situations, as indicated in Table 5-1.
These bits are used in software to determine the nature
of the Reset.
Table 5-2 describes the Reset states for all of the
Special Function Registers. These are categorized by
Power-on and Brown-out Resets, Master Clear and
WDT Resets and WDT wake-ups.
TABLE 5-1:
STATUS BITS, THEIR SIGNIFICANCE AND THE INITIALIZATION CONDITION FOR
RCON REGISTER
Condition
Program
Counter(1)
RCON Register
STKPTR Register
CM
RI
TO
PD
POR
BOR
STKFUL STKUNF
Power-on Reset
0000h
1
1
110
0
0
0
RESET
Instruction
0000h
u
0
uuu
u
u
u
Brown-out Reset
0000h
1
1
11u
0
u
u
MCLR during
power-managed Run
modes
0000h
u
u
1uu
u
u
u
MCLR during power-
managed Idle modes and
Sleep mode
0000h
u
u
10u
u
u
u
WDT time-out during full
power or power-managed
Run modes
0000h
u
u
0uu
u
u
u
MCLR during full-power
execution
0000h
u
u
uuu
u
u
u
Stack Full Reset
(STVREN = 1)
0000h
u
u
uuu
u
1
u
Stack Underflow Reset
(STVREN = 1)
0000h
u
u
uuu
u
u
1
Stack Underflow Error (not
an actual Reset,
STVREN = 0)
0000h
u
u
uuu
u
u
1
WDT time-out during
power-managed Idle or
Sleep modes
PC + 2
u
u
00u
u
u
u
Interrupt exit from
power-managed modes
PC + 2
u
u
u0u
u
u
u
Legend: u = unchanged
Note 1:
When the wake-up is due to an interrupt and the GIEH or GIEL bit is set, the PC is loaded with the
interrupt vector (0008h or 0018h).



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