UPD78F9502MA-CAC-A NEC, UPD78F9502MA-CAC-A Datasheet - Page 143

• Manufacturer Part Number: UPD78F9502MA-CAC-A
• Description: 8BIT MCU, 4K FLASH, 128B RAM, SMD
• Manufacturer: NEC

Specifications of UPD78F9502MA-CAC-A

• Controller Family/series: UPD78F
• No. Of I/o's: 8
• Ram Memory Size: 128Byte
• Cpu Speed: 10MHz
• No. Of Timers: 2
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 4KB
• Oscillator Type: External, Internal

14.7.3 Security settings
memory is shipped. The above security settings are possible only for on-board/off-board programming. Each security
setting can be used in combination.
78F9502 security function is enabled.
The operations shown below can be prohibited using the security setting command.
The batch erase (chip erase), block erase, and write commands are enabled by the default setting when the flash
Table 14-5 shows the relationship between the erase and write commands when the
Batch erase (chip erase) is prohibited
Execution of the block erase and batch erase (chip erase) commands for entire blocks in the flash memory is
prohibited. Once execution of the batch erase (chip erase) command is prohibited, all the prohibition settings can
no longer be cancelled.
Caution After the security setting of the batch erase is set, erasure cannot be performed for the device.
Block erase is prohibited
Execution of the block erase command in the flash memory is prohibited. This prohibition setting can be
cancelled using the batch erase (chip erase) command.
Write is prohibited
Execution of the write and block erase commands for entire blocks in the flash memory is prohibited. This
prohibition setting can be cancelled using the batch erase (chip erase) command.
Remark
Note Since the erase command is disabled, data different from that which has already been written to the
Security
When batch erase (chip erase) security
operation is enabled
When block erase security operation is
enabled
When write security operation is enabled
Table 14-5. Relationship Between Commands When Security Function Is Enabled
In addition, even if a write command is executed, data different from that which has already
been written to the flash memory cannot be written because the erase command is disabled.
The security setting is valid when the programming mode is set next time.
flash memory cannot be written.
ACK
NAK
Command Name
Command
Preliminary User’s Manual U18681EJ1V0UD
CHAPTER 14 FLASH MEMORY
Table 14-4. Response Name
Disabled
Enabled
Batch Erase (Chip
Erase) Command
Acknowledges command/data.
Acknowledges illegal command/data.
Disabled
Block Erase
Command
Function
Enabled
Enabled
Disabled
Write Command
PD78F9500, 78F9501,
Note
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