C8051F020's XRAM and non-volatile storage-EEWORLD

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C8051F020 has 4Kbyte XRAM and 128byte non-volatile storage (equivalent to EEPROM). First, check the two options in Keil as shown below.

C8051F020's XRAM and non-volatile storage

Then to use XRAM, just define the variable type as XDATA. It is best not to initialize it in the definition, otherwise there may be problems. If you need to use non-volatile storage, you need to write a driver, which is also very easy. First, turn off the interrupt before the operation; restore the interrupt status after the operation is completed. The related registers are FLSCL and PSCTL. It should be noted that writing FLASH can only change 1 to 0, so the entire sector must be erased before writing bytes. The variable type of the write byte is XDATA, using MOVX, and the read is to point to CODE, using MOVC. For example, the write pointer can be defined as uchar xdata *pwrite; the read can be defined as uchar code *pread; of course, when assigning a value to the pointer, it should be converted into a pointer variable, such as pwrite=(uchar xdata *)=addr; pread=(uchar code *)=addr; then assign a value to the space pointed to by the pointer.

Keywords：C8051F020 Reference address：C8051F020's XRAM and non-volatile storage

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