Modifying Flash Program Memory

When modifying existing data in a program memory, data within the memory row must be read and saved in a RAM image. Program memory is modified using the following steps:
  1. 1.Load the starting address of the row to be modified.
  2. 2.Read the existing data from the row into a RAM image.
  3. 3.Modify the RAM image to contain the new data to be written into program memory.
  4. 4.Load the starting address of the row to be rewritten.
  5. 5.Erase the program memory row.
  6. 6.Load the write latches with data from the RAM image.
  7. 7.Initiate a programming operation.
Figure 1. Program Flash Memory Modify Sequence
  1. 1.See Figure 1.
  2. 2.See Figure 1.
  3. 3.See Figure 2.