PIC12F508 datasheet(20/106 Pages) MICROCHIP

20 / 106 page

PIC12F508/509/16F505

DS41236D-page 18

Preliminary

4.3.2

SPECIAL FUNCTION REGISTERS

The Special Function Registers (SFRs) are registers

used by the CPU and peripheral functions to control the

operation of the device (Table 4-1).

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 4-1:

SPECIAL FUNCTION REGISTER (SFR) SUMMARY (PIC12F508/509)

Address

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1 Bit 0

Value on

Power-On

Reset(2)

Page #

00h

INDF

Uses Contents of FSR to Address Data Memory (not a physical

xxxx xxxx

01h

TMR0

8-bit Real-Time Clock/Counter

xxxx xxxx

02h(1)

PCL

Low-order 8 bits of PC

1111 1111

03h

STATUS

GPWUF

—PA0(5)

ZDC

0-01 1xxx(3)

04h

FSR

Indirect Data Memory Address Pointer

111x xxxx

04h(4)

FSR

Indirect Data Memory Address Pointer

110x xxxx

05h

OSCCAL

CAL6

CAL5

CAL4

CAL3

CAL2

CAL1

CAL0

—

1111 111-

06h

GPIO

—

GP5

GP4

GP3

GP2

GP1

GP0

--xx xxxx

N/A

TRISGPIO

—

I/O Control Register

--11 1111

N/A

OPTION

GPWU GPPU TOCS TOSE

PSA

PS2

PS1

PS0

1111 1111

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

Note 1: The upper byte of the Program Counter is not directly accessible. See Section 4.7 “Program Counter”

for an explanation of how to access these bits.

2: Other (non Power-up) Resets include external Reset through MCLR, Watchdog Timer and wake-up on pin

change Reset.

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

4: PIC12F509 only.

5: This bit is used on the PIC12F509. For code compatibility do not use this bit on the PIC12F508.

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