UPD78F9222MC(T)-5A4-A NEC, UPD78F9222MC(T)-5A4-A Datasheet - Page 287
UPD78F9222MC(T)-5A4-A
Manufacturer Part Number
UPD78F9222MC(T)-5A4-A
Description
8BIT MCU, 4K FLASH, 256B RAM, 78F9222
Manufacturer
NEC
Datasheet
1.UPD78F9222MCT-5A4-A.pdf
(414 pages)
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
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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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287
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