UPD78F9222MC(T)-5A4-A NEC, UPD78F9222MC(T)-5A4-A Datasheet - Page 290

• Manufacturer Part Number: UPD78F9222MC(T)-5A4-A
• Description: 8BIT MCU, 4K FLASH, 256B RAM, 78F9222
• Manufacturer: NEC

Specifications of UPD78F9222MC(T)-5A4-A

• Controller Family/series: UPD78
• No. Of I/o's: 17
• Ram Memory Size: 256Byte
• Cpu Speed: 10MHz
• No. Of Timers: 4
• No. Of: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 4KB
• Oscillator Type: External, Internal

18.8.5 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 FLCMD (FLCMD = 00H).
<2> Clear the flash status register (PFS).
<3> Set normal mode using a specific sequence.
<4> Check the execution result of the specific sequence using bit 0 (FPRERR) of PFS
<5> Enable interrupt servicing (by executing the EI instruction and changing MK0 and MK1) to restore the original
<6> Mode shift is completed
Note Restore the CPU clock to its setting before self programming, after normal execution of the specific
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 → <2>, normal → <5>
state.
sequence.
address where data is not erased or written.
CHAPTER 18 FLASH MEMORY
User’s Manual U16898EJ5V0UD
Note
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