24.15 Page Erase

A Page Erase performs an erase of a single page of either PFM or BFM.

The page to be erased is selected using the NVMADDR register. Pages are always erased on page boundaries; therefore, for a device with an instruction Word page size of 4096, bits 0 through 11 of the NVMADDR register are ignored.

A Page Erase will only succeed if the target address is a page that is not write-protected. Erasing a write-protected page will fail and result in the WRERR bit being set in the NVMCON register.

The following code shows the code for a single Page Erase operation at address 0x1008000.

Page Erase Code Example:

…

// set destination page address
    NVMADDR = 0x1008000;     // page physical address

// define Flash operation
    NVMCONbits.NVMOP = 0x4;    // NVMOP for Page Erase

// Enable Flash Write
    NVMCONbits.WREN = 1;

// commence programming
    NVMInitiateOperation();    // see Initiate NVM Operation (Unlock Sequence Example)

// Wait for WR bit to clear
    while(NVMCONbits.WR);

// Disable future Flash Write/Erase operations
    NVMCONbits.WREN = 0;

// Check Error Status
    if(NVMCON & 0x3000)    // mask for WRERR and LVDERR bits
    { 
        // process errors
    }

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