upd78f9211grt2-jjg-a ETC-unknow, upd78f9211grt2-jjg-a Datasheet - Page 234

• Manufacturer Part Number: upd78f9211grt2-jjg-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: ETC-unknow

16.8.5 Example of shifting self programming mode to normal mode
programming.
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The operating mode must be returned from self programming mode to normal mode after performing self
An example of shifting to normal mode is explained below.
<1> Clear the flash status register (PFS).
<2> Set normal mode using a specific sequence.
<3> Check the execution result of the specific sequence using bit 0 (FPRERR) of PFS.
<4> Enable interrupt servicing (by executing the EI instruction and changing MK0) to restore the original state.
<5> Mode shift is completed
Caution Be sure to perform the series of operations described above using the user program at an
• Write the specific value (A5H) to PFCMD.
• Write 00H to FLPMC (writing in this step is invalid)
• Write 0FFH (inverted value of 00H) to FLPMC (writing in this step is invalid)
• Write 00H to FLPMC (writing in this step is valid)
Abnormal → <1>, normal → <4>
address where data is not erased nor written.
CHAPTER 16 FLASH MEMORY
User’s Manual U16994EJ3V0UD