CF745 datasheet(36/217 Pages) MICROCHIP

36 / 217 page

PIC16C5X

DS30453B-page 36

Preliminary

TABLE 7-3:

RESET CONDITIONS FOR SPECIAL REGISTERS

TABLE 7-4:

RESET CONDITIONS FOR ALL REGISTERS

FIGURE 7-8:

SIMPLIFIED BLOCK DIAGRAM OF ON-CHIP RESET CIRCUIT

Condition

PCL

Addr: 02h

STATUS

Addr: 03h

Power-On Reset

1111 1111

0001 1xxx

MCLR reset (normal operation)

1111 1111

000u uuuu(1)

MCLR wake-up (from SLEEP)

1111 1111

0001 0uuu

WDT reset (normal operation)

1111 1111

0000 uuuu(2)

WDT wake-up (from SLEEP)

1111 1111

0000 0uuu

Legend: u = unchanged, x = unknown, - = unimplemented read as '0'.

Note 1: TO and PD bits retain their last value until one of the other reset conditions occur.

2: The CLRWDT instruction will set the TO and PD bits.

Address

Power-On Reset

MCLR or WDT Reset

N/A

xxxx xxxx

uuuu uuuu

TRIS

N/A

1111 1111

OPTION

N/A

--11 1111

INDF

00h

xxxx xxxx

uuuu uuuu

TMR0

01h

xxxx xxxx

uuuu uuuu

PCL(1)

02h

1111 1111

STATUS(1)

03h

0001 1xxx

000q quuu

FSR

04h

1xxx xxxx

1uuu uuuu

PORTA

05h

---- xxxx

---- uuuu

PORTB

06h

xxxx xxxx

uuuu uuuu

PORTC(2)

07h

xxxx xxxx

uuuu uuuu

General Purpose Register Files

07-7Fh

xxxx xxxx

uuuu uuuu

Legend: u = unchanged, x = unknown, - = unimplemented, read as '0',

= see tables in Section 7.7 for possible values.

Note 1: See Table 7-3 for reset value for speciﬁc conditions.

2: General purpose register ﬁle on PIC16C52/C54s/CR54s/C56s/CR56s/C58s/CR58s

8-bit Asynch

Ripple Counter

(Start-Up Timer)

VDD

MCLR/VPP pin

Power-Up

Detect

On-Chip

RC OSC

POR (Power-On Reset)

WDT Time-out

RESET

CHIP RESET

WDT

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