tmp19a43fd TOSHIBA Semiconductor CORPORATION, tmp19a43fd Datasheet - Page 60

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

4.
      <FLASH/MASK>
4.1 Overview
4.2 Features
Various protecting functions
The ROM protect function for designating the internal ROM (flash) area as a read-protected area and the DSU
protect function for prohibiting the use of DSU (DSU-Probe) are built into the TMP19A43. The read protect
functions specifically include the following:
4.2.1
<FLASH>
A built-in flash can prohibit the operation of writing and the deletion at every the block of every 128
Kbyte. This function is called the block protecting.
To make the block protecting function effective, it protects it corresponding to the block where it wants
to put protecting.
The bit is made "1". The block protecting can be released by making the protecting bit "0". (Please see
the chapter of the Flash operation explanation about the program method. )The protecting bit can be
monitored by FLCS register < BLPRO3:0 > bit.
The state to put protecting on all blocks is called the FLASH protecting. It is necessary to note it
because all the protecting bits become "0" after automatically deleting all data of the flash when the
protecting release operates after it puts it into the state of the LASH protecting of 1°F(operation that
makes the protecting bit "0").
<Mask>
FLASH is always being protected in the mask version, and the FLASH protecting cannot be
released. This function doesn't influence usual operation in the mask version.
It is necessary to be protecting FLASH to make "ROM data protecting" and "DSU protecting" that
will explain in the future effective.
Flash protect function
ROM data protect function
DSU protect function
Flash Protect Function
TMP19A43 (rev2.0) 4-1
Various protecting functions
TMP19A43