tmp19a61f10xbg TOSHIBA Semiconductor CORPORATION, tmp19a61f10xbg Datasheet - Page 539

• Manufacturer Part Number: tmp19a61f10xbg
• Description: 32-bit Tx System Risc Tx19 Family
• Manufacturer: TOSHIBA Semiconductor CORPORATION

23.5 Proted-related/ Release Settings
23.5.1 Flash Protect Function
Flash protecting is designed to be always enabled for MASK and cannot be disabled. The Flash
protecting function becomes effective by putting the block protecting on all the blocks. The flash
memory protecting bit program commands are used to enable or disable the flash read protect
function. For further information, refer to the command sequence explained in the chapter describing
the operations of flash memory.
The protecting bit is cleared after all the data in the flash is deleted when the protecting bit release
command is executed with the flash protected, and the flash protecting is released.
In the state of ROM data protecting, explains as follows, the command execution to the flash is
disregarded. It is necessary to release ROM data protecting first clearing the RSECON bit of ROM
protecting register when the flash protecting is released with ROM protected.
If it is necessary to overwrite Flash memory or protect bits in a protected state, "automatic protect bit
deletion" must be executed or the ROM protect function must be disabled. DSU cannot be used if it is
in a protected state.
Flash memory may go into a read-protected state after the automatic protect bit program is executed.
In this case, it is necessary to set DSU-PROBE to "enable" before the automatic protect bit program
is executed.
If "automatic protect bit deletion" is executed when Flash memory is in a read-protected state, Flash
memory is automatically initialized inside this device. Therefore, release the ROM data protection in
advance to rewrite the data in Flash memory.
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