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CHAPTER 27
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PD78F4225 AND
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PD78F4225Y PROGRAMMING
User’s Manual U12697EJ3V0UM
Figure 27-2. Format of Communication Mode Selection
27.3.2 On-board overwrite mode functions
By transmitting and receiving various commands and data by the selected communication protocol, operations
such as writing to the flash memory are performed. Table 27-4 shows the major functions.
Table 27-4. Major Functions of On-Board Overwrite Mode
Function
Description
Area erase
Erase the contents of the specified memory area.
Area blank check
Checks the erase state of the specified area.
Data write
Writes to the flash memory based on the start write address and the number of data written (the
number of bytes).
Area verify
Compares the data input to the contents of the specified memory area.
Verification for the flash memory entails supplying the data to be verified from an external source via a serial
interface, and then outputting the existence of unmatched data to the external source after referencing the areas or
all of the data. Consequently, the flash memory is not equipped with a read function, and it is not possible for third
parties to read the contents of the flash memory with the use of the verification function.
1
2
n
10 V
V
DD
V
SS
V
PP
V
DD
V
SS
RESET
Flash writing mode
V
PP
pulse
