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__CONFIG 0x03F71
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CONFIGURATION FUSES
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TABLE 9.5 LABEL
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PIC16F877 CONFIGURATION FUSE CONSTANTS TAKEN FROM P16F877.INC VALUE OPERATION
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_BODEN_ON _BODEN_OFF _CP_ALL _CP_HALF _CP_UPPER_256 _CP_OFF _WRT_ENABLE_OFF _PWRTE_OFF _PWRTE_ON _WDT_ON _WDT_OFF _LP_OSC _XT_OSC _HS_OSC _RC_OSC _DEBUG_ON _DEBUG_OFF _CPD_ON _CPD_OFF _LVP_ON _LVP_OFF
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0x03FFF 0x03FBF 0x00FCF 0x01FDF 0x02FEF 0x03FFF 0x03DFF 0x03FFF 0x03FF7 0x03FFF 0x03FFB 0x03FFC 0x03FFD 0x03FFE 0x03FFF 0x037FF 0x03FFF 0x03EFF 0x03FFF 0x03FFF 0x03F7F
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Brown-out reset detect enabled Brown-out reset detect disabled All program memory protected Upper half of program memory protected Upper 256 bytes of program memory protected No code protection Program memory can be written to from application 72-ms time-up delay off 72-ms time-up delay on Watchdog timer on Watchdog timer off LP oscillator type XT oscillator type HS oscillator type RC oscillator Internal emulator enabled Internal emulator disabled Data EEPROM write protected Data EEPROM not write protected Low-voltage program enabled Low-voltage program disabled
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One feature of the __CONFIG directive is that it is located differently for the different PIC microcontroller families. For low-end devices, the con guration fuses are at 0xFFF. For mid-range devices, they are at 0x2007. The PIC17 s con guration fuses are in the address range 0xFE00 to 0xFE07. Finally, the PIC18 s con guration fuses are at the address ranges 0x300000 to 0x30000F. For low-end and mid-range parts, I like to think of the __CONFIG directive being the equivalent to an ORG statement with a dw statement. Using the preceding example, this would make the __CONFIG statement equivalent to
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org dw 0x02007 0x03F71
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BASIC OPERATING FEATURES
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TABLE 9.6 LABEL
PIC18F877 CONFIGURATION FUSE CATEGORIES OPTION
BODEN CP WRT_ENABLE PWRTE OSC DEBUG CPD LVP
Brown-out detect Code protect Program memory application write enable 72-ms power-up wait timer Oscillator type Built in ICD interface hardware Data EEPROM write enable Low-voltage programming enable
Along with the con guration fuses, four nybbles are available for serial numbers, IDs, or application version information and are loaded using the __IDLOCS (again, two underscores) directive. Each nybble of the 16-bit __IDLOCS directive parameter is placed in one of the IDLOCS program memory locations. For example, in a mid-range PIC microcontroller, the statement
__IDLOCS 0x01234
will load the program memory with the contents listed in Table 9.7. This data storage may seem like a waste (because every instruction location has 14 bits and only 4 are used), but this is how __IDLOCS works. Taking a clue from my description of how __CONFIG works, you could code the data into the four __IDLOCS locations as
org dw 0x02000 IDLOCS_VALUE1
TABLE 9.7 MID-RANGE PIC MICROCONTROLLER IDLOCS DATA PLACEMENT ADDRESS DATA
0x02000 0x02001 0x02002 0x02003
0x00001 0x00002 0x00003 0x00004
CONFIGURATION FUSES
dw dw dw
IDLOCS_VALUE2 IDLOCS_VALUE3 IDLOCS_VALUE4
The __IDLOCS and __CONFIG data are stored outside the application-accessible program memory in the low-end, mid-range, and PIC18 microcontrollers. The values put into the respective program memory areas can be accessed directly by the PIC17.
PIC18 con guration fuses The PIC18 devices have a large number of con gura-
tion fuses, and they conceivably can be stored in sixteen 16-bit program memory addresses with a total number of possible options of 256. As with low-end and mid-range PIC microcontroller s con guration registers, I recommend that you list every category of con guration fuse for the PIC18 part number you are working with and establish the category of each con guration feature and make sure that a selection is made for each one. The large number of options will make this task tedious but should save you from having problems later when you are trying to bring up the application. When the PIC18 microcontrollers rst came out and were added to MPASM, each of the different program memory word bytes had to have its address and the high/low byte speci ed, along with the fuses that were to be modi ed and ANDed together. The __CONFIG statements looked something like:
__con g 0x300000L _HS_OSC & _WDT_OFF __con g 0x300000H _PWRTE_ON __con g 0x300002L _CP_OFF & _CPD_OFF
and it is a lot of work to go through the datasheet and .inc le to make sure that everything is listed and correct. The latest versions of MPASM improve this work and make it somewhat easier to get right by having you specify the feature and state while ignoring the register address and the need to AND them together. For example, the ve options above could be entered into the single __CONFIG statement:
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