Syntax:
DeviceConfigurationRead (location, store)
Command Availability:
Available on all Microchip PIC microcontrollers with self-read capability. Not currently available on Atmel AVR.
Explanation:
DeviceConfigurationRead reads information from the device configuration area of memory on chips that support this feature — the area holding configuration
words (fuses) such as oscillator selection, watchdog timer setup, and code-protection bits, rather than the general program-memory
space that ProgramRead accesses. location and store are both word variables, meaning they can hold values greater than 255.
The range of location depends on the amount of configuration memory on the Microchip PIC microcontroller, given in the datasheet. store is 14 bits wide, and can therefore store values up to 16383.
This is an advanced command intended for developers who need to inspect a chip’s own configuration bits at run time; most
programs never need to call it, since configuration is normally set once at compile time with #config.
Example:
#chip 18F26K22, 16
Dim ConfigLocation As Word
Dim ConfigValue As Word
ConfigLocation = 0x300000 ' start of the configuration word area on this chip
DeviceConfigurationRead ( ConfigLocation, ConfigValue ) ' <<< the DeviceConfigurationRead instruction
HSerPrint ConfigValueKey line: DeviceConfigurationRead ( ConfigLocation, ConfigValue ) — reads the configuration word at ConfigLocation back into ConfigValue for inspection at run time.
See Also:
- ProgramRead — reading ordinary program memory rather than configuration words
- ProgramErase / ProgramWrite — modifying ordinary program memory
