PIC17C752-08SLASHP datasheet(178/320 Pages) MICROCHIP

178 / 320 page

PIC17C75X

DS30264A-page 178

Preliminary

17.1 Conﬁguration Bits

The PIC17CXXX has eight conﬁguration locations

(Table 17-1). These locations can be programmed

(read as '0') or left unprogrammed (read as '1') to select

various device conﬁgurations. Any write to a conﬁgura-

tion location, regardless of the data, will program that

conﬁguration bit. A TABLWT instruction is required to

write to program memory locations. The conﬁguration

bits can be read by using the TABLRD instructions.

Reading any conﬁguration location between FE00h

and FE07h will read the low byte of the conﬁguration

word (Figure 17-1) into the TABLATL register. The TAB-

LATH register will be FFh. Reading a conﬁguration

location between FE08h and FE0Fh will read the high

byte of the conﬁguration word into the TABLATL regis-

ter. The TABLATH register will be FFh.

Addresses FE00h thorough FE0Fh are only in the pro-

gram memory space for microcontroller and code pro-

tected microcontroller modes. A device programmer

will be able to read the conﬁguration word in any pro-

cessor mode. See programming speciﬁcations for

more detail.

TABLE 17-1: CONFIGURATION

LOCATIONS

Bit

Address

FOSC0

FE00h

FOSC1

FE01h

WDTPS0

FE02h

WDTPS1

FE03h

PM0

FE04h

PM1

FE06h

BODEN

FE0Eh

PM2

FE0Fh

Note: When programming the desired conﬁgura-

tion locations, they must be programmed

in ascending order. Starting with address

FE00h.

17.2 Oscillator Conﬁgurations

17.2.1

OSCILLATOR TYPES

The PIC17CXXX can be operated in four different oscil-

lator modes. The user can program two conﬁguration

bits (FOSC1:FOSC0) to select one of these four

modes:

• LF

Low Power Crystal

• XT

Crystal/Resonator

• EC

External Clock Input

• RC

Resistor/Capacitor

For information on the different oscillator types and

how to use them, please refer to Section 4.0.

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