tmp19a43fd TOSHIBA Semiconductor CORPORATION, tmp19a43fd Datasheet - Page 68

• Manufacturer Part Number: tmp19a43fd
• Description: 32-bit Risc Microprocessor
• Manufacturer: TOSHIBA Semiconductor CORPORATION

4.5 Proted-related / Release Settings
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.
ÔThe mask version is possible only the release of ROM security, and the protecting bit cannot be rewritten.Õ
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, extra caution must be used when switching from one state
to a read-protected state. (FLASH only)
4.5.1
It becomes effective by putting the block protecting on all of the four blocks in the flash version.
disable the flash read protect function. For further information, refer to the command sequence
explained in the chapter describing the operations of flash memory.
(notes concerning FLASH version)
The protecting bit is cleared after all the data of 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.
The flash protecting function cannot be released always effectively in the mask version.
The flash memory command sequence and protect bit program commands are used to enable or
Flash Protect Function
TMP19A43 (rev2.0) 4-9
Various protecting functions
TMP19A43