PIC18F45J50-I/SOSQTP 데이터 시트보기 (PDF) - Microchip Technology

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PIC18F45J50-I/SOSQTP

28/44-Pin, Low-Power, High-Performance USB Microcontrollers with nanoWatt XLP Technology

Microchip Technology 

PIC18F46J50 FAMILY

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

POR and BOR, MCLR 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) CM

RCON Register

STKPTR Register

RI TO PD POR BOR STKFUL STKUNF

Power-on Reset

RESET instruction

0000h

1

1

1

1

0

0

0

0

0000h

u

0

u

u

u

u

u

u

Brown-out Reset

0000h

1

1

1

1

u

0

u

u

Configuration Mismatch Reset

0000h

0

u

u

u

u

u

u

u

MCLR Reset during

0000h

u

u

1

u

u

u

u

u

power-managed Run modes

MCLR Reset during

0000h

u

u

1

0

u

u

u

u

power-managed Idle modes and

Sleep mode

MCLR Reset during full-power

0000h

u

u

u

u

u

u

u

u

execution

Stack Full Reset (STVREN = 1) 0000h

u

u

u

u

u

u

1

u

Stack Underflow Reset

(STVREN = 1)

0000h

u

u

u

u

u

u

u

1

Stack Underflow Error (not an

0000h

u

u

u

u

u

u

u

1

actual Reset, STVREN = 0)

WDT time-out during full-power 0000h

u

u

0

u

u

u

u

u

or power-managed Run modes

WDT time-out during

PC + 2

u

u

0

0

u

u

u

u

power-managed Idle or Sleep

modes

Interrupt exit from

power-managed modes

PC + 2

u

u

u

0

u

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).

DS39931D-page 68

 2011 Microchip Technology Inc.

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