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PIC16C505T-04/SL

14-Pin, 8-Bit CMOS Microcontroller

Microchip Technology 

PIC16C505

TABLE 7-3: RESET CONDITIONS FOR REGISTERS

Register

Address

Power-on Reset

MCLR Reset

WDT time-out

Wake-up on Pin Change

W

—

qqqq qqqq(1)

qqqq qqqq(1)

INDF

TMR0

00h

xxxx xxxx

uuuu uuuu

01h

xxxx xxxx

uuuu uuuu

PC

02h

1111 1111

1111 1111

STATUS

03h

0001 1xxx

q00q quuu(2,3)

FSR

04h

110x xxxx

11uu uuuu

OSCCAL

05h

1000 00--

uuuu uu--

PORTB

PORTC

06h

--xx xxxxx

--uu uuuu

07h

--xx xxxxx

--uu uuuu

OPTION

—

1111 1111

1111 1111

TRISB

—

--11 1111

--11 1111

TRISC

—

--11 1111

--11 1111

Legend: u = unchanged, x = unknown, - = unimplemented bit, read as ‘0’, q = value depends on condition.

Note 1: Bits <7:2> of W register contain oscillator calibration values due to MOVLW XX instruction at top of

memory.

Note 2: See Table 7-7 for reset value for specific conditions.

Note 3: If reset was due to wake-up on pin change, then bit 7 = 1. All other resets will cause bit 7 = 0.

TABLE 7-4: RESET CONDITION FOR SPECIAL REGISTERS

STATUS Addr: 03h

PCL Addr: 02h

Power on reset

0001 1xxx

MCLR reset during normal operation

000u uuuu

MCLR reset during SLEEP

0001 0uuu

WDT reset during SLEEP

0000 0uuu

WDT reset normal operation

0000 uuuu

Wake-up from SLEEP on pin change

1001 0uuu

Legend: u = unchanged, x = unknown, - = unimplemented bit, read as ‘0’.

1111 1111

1111 1111

1111 1111

1111 1111

1111 1111

1111 1111

© 1999 Microchip Technology Inc.

DS40192C-page 31

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