PIC configuration bit

I. Configuration words
You can use the _ config command to define the configuration word of the PIC microcontroller:
# Include
_ Config (X)
X is the configuration word, and the header file defines the corresponding configuration specifiers, such:
_ Config (wdtdis & XT & unprotect );
This will disable the watchdog and set the XT vibrator,ProgramNot encrypted. Note: Different configuration characters are associated with '&'. undefined parts are retained. For details, refer to the header file and the PIC Data Manual.

Ii. ID location
Some PIC Single-chip computers also have ID space outside the program space, which can be defined using the following method:
# Include
_ Idloc (x) where X is the ID, for example:
_ Idloc (15f0 );
The four units of ID are defined as: 1, 5, 15, 0. the specific position of ID is automatically set by the specified PIC chip.

Iii. EEPROM data
Some PIC Single-Chip Microcomputer support programming internal EEPROM with an external programmer.
_ Eeprom_data () can put the data for initialization into the Hex file, for example:
_ Eeprom_data (0, 1, 2, 3, 4, 5, 6, 7)
You can add the numbers 0-7 to the Hex file, and write these eight numbers into the PIC microcontroller when programming with an external programmer.
_ Eeprom_data is not used to write EEPROM data during runtime. during runtime, use eeprom_read () and eeprom_write ().

 

The _ config setting of pic18 is different from that of pic16. For example, pic16:

_ Config (_ cp_off & _ wdt_on & _ boden_on & _ pwrte_on & _ rc_osc); is written together.

Pic18 is not written together, And config1.. 7 is written separately. For example:

_ Config (1, iesodis & fcmdis & HS );
_ Config (2, Boren & pwrten & wdtdis & wdtwindis & wdtps32k );
_ Config (3, mclren );
_ Config (4, debugen & xinsten & stvrdis );
_ Config (5, unprotect );

The _ config (n, x) function is prototype in pic18. H file. The settings are in pic18fxx22. H.

The preceding settings mean:

// Content is defined in pic18fxx22. h.
// 1. oscillator switch off & Fault Protection clock monitor off & High-speed mode
// 2. undervoltage reset on & power-on delay on & watchdog off & watchdog frequency
// 3. The mclr is used to reset the pin.
// 4. Enable the Background Debugger & enable instruction set extension & Stack Overflow without resetting
// 5.CodeNot Protected