UPD78F9222MC(T)-5A4-A NEC, UPD78F9222MC(T)-5A4-A Datasheet - Page 287

• 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

18.8.4 Example of shifting normal mode to self programming mode
programming.
The operating mode must be shifted from normal mode to self programming mode before performing self
An example of shifting to self programming mode is explained below.
<1> Disable interrupts if the interrupt function is used (by setting the interrupt mask flag registers (MK0, MK1) to
<2> Clear FLCMD (FLCMD = 00H).
<3> Clear the flash status register (PFS).
<4> Set self programming mode using a specific sequence
<5> Execute NOP instruction and HALT instruction.
<6> Check the execution result of the specific sequence using bit 0 (FPRERR) of PFS.
<7> Mode shift is completed.
Note If the CPU clock is lower than 1 MHz, set it to be 1 MHz or higher.
Caution Be sure to perform the series of operations described above using the user program at an
FFH and executing the DI instruction).
• Write a specific value (A5H) to PFCMD.
• Write 01H to FLPMC (writing in this step is invalid).
• Write 0FEH (inverted value of 01H) to FLPMC (writing in this step is invalid).
• Write 01H to FLPMC (writing in this step is valid).
Abnormal → <3>, normal → <7>
address where data is not erased or written.
CHAPTER 18 FLASH MEMORY
User’s Manual U16898EJ5V0UD
Note
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