PIC17C752 MICROCHIP [Microchip Technology], PIC17C752 Datasheet - Page 178

• Manufacturer Part Number: PIC17C752
• Description: High-Performance 8-Bit CMOS EPROM Microcontrollers
• Manufacturer: MICROCHIP [Microchip Technology]

17.1
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:
DS30264A-page 178
Note:
WDTPS0
WDTPS1
Configuration Bits
BODEN
FOSC0
FOSC1
PM0
PM1
PM2
When programming the desired configura-
tion locations, they must be programmed
in ascending order. Starting with address
FE00h.
Bit
CONFIGURATION
LOCATIONS
Address
FE00h
FE01h
FE02h
FE03h
FE04h
FE06h
FE0Eh
FE0Fh
Preliminary
17.2
17.2.1
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
For information on the different oscillator types and
how to use them, please refer to Section 4.0.
Oscillator Configurations
OSCILLATOR TYPES
Low Power Crystal
Crystal/Resonator
External Clock Input
Resistor/Capacitor
1997 Microchip Technology Inc.