PIC16F54-ESLASHP datasheet(18/88 Pages) MICROCHIP

18 / 88 page

PIC16F5X

DS41213D-page 16

3.2.2

SPECIAL FUNCTION REGISTERS

The Special Function Registers (SFR) are registers

used by the CPU and peripheral functions to control the

operation of the device (Table 3-1).

The Special Function Registers can be classified into

two sets. The Special Function Registers associated

with the “core” functions are described in this section.

Those related to the operation of the peripheral

features are described in the section for each

peripheral feature.

TABLE 3-1:

SPECIAL FUNCTION REGISTER SUMMARY

Address

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Value on

Power-on

Reset

Details

on Page

N/A

TRIS

I/O Control Registers (TRISA, TRISB, TRISC, TRISD, TRISE)

1111 1111

N/A

OPTION

Contains control bits to configure Timer0 and Timer0/WDT

prescaler

--11 1111

00h

INDF

Uses contents of FSR to address data memory (not a physical

xxxx xxxx

01h

TMR0

Timer0 Module Register

xxxx xxxx

02h

PCL(1)

Low order 8 bits of PC

1111 1111

03h

STATUS

PA2

PA1

PA0

ZDC

0001 1xxx

04h

FSR(3)

Indirect data memory Address Pointer

111x xxxx

04h

FSR(4)

Indirect data memory Address Pointer

1xxx xxxx

04h

FSR(5)

Indirect data memory Address Pointer

xxxx xxxx

05h

PORTA(6)

—

RA3

RA2

RA1

RA0

---- xxxx

06h

PORTB

RB7

RB6

RB5

RB4

RB3

RB2

RB1

RB0

xxxx xxxx

07h

PORTC(2)

RC7

RC6

RC5

RC4

RC3

RC2

RC1

RC0

xxxx xxxx

08h

PORTD(7)

RD7

RD6

RD5

RD4

RD3

RD2

RD1

RD0

xxxx xxxx

09h

PORTE(6), (7)

RE7

RE6

RE5

RE4

—

xxxx ----

Legend: Shaded cells = unimplemented or unused, – = unimplemented, read as ‘0’ (if applicable), x = unknown,

= unchanged

Note 1:

The upper byte of the Program Counter is not directly accessible. See Section 3.5 “Program Counter”

for an explanation of how to access these bits.

File address 07h is a General Purpose Register on the PIC16F54.

PIC16F54 only.

PIC16F57 only.

PIC16F59 only.

Unimplemented bits are read as ‘0’s.

File address 08h and 09h are General Purpose Registers on the PIC16F54 and PIC16F57.

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