PIC17C7XX_13 Datasheet, PDF (192/306 Pages) Microchip Technology – High-Performance 8-bit CMOS EPROM Microcontrollers with 10-bit A/D

PIC17C7XX
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
configuration location, regardless of the data, will pro-
gram that configuration bit. A TABLWT instruction and
raising the MCLR/VPP pin to the programming voltage
are both required to write to program memory loca-
tions. The configuration bits can be read by using the
TABLRD instructions. Reading any configuration loca-
tion between FE00h and FE07h will read the low byte
of the configuration word (Figure 17-1) into the TAB-
LATL register. The TABLATH register will be FFh.
Reading a configuration location between FE08h and
FE0Fh will read the high byte of the configuration word
into the TABLATL register. The TABLATH register will
be FFh.
Addresses FE00h through 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
FOSC0
FOSC1
WDTPS0
WDTPS1
PM0
PM1
BODEN
PM2
Address
FE00h
FE01h
FE02h
FE03h
FE04h
FE06h
FE0Eh
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
• XT
• EC
• RC
Low Power Crystal
Crystal/Resonator
External Clock Input
Resistor/Capacitor
For information on the different oscillator types and
how to use them, please refer to Section 4.0.
DS30289C-page 192
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