tmp19a44fda TOSHIBA Semiconductor CORPORATION, tmp19a44fda Datasheet - Page 625

• Manufacturer Part Number: tmp19a44fda
• Description: 32bit Tx System Risc
• Manufacturer: TOSHIBA Semiconductor CORPORATION

25. Various protecting functions
An internal FLASH can prohibit the operation of writing and the deletion per protected area. This function is called the
flash protection.
To make the protection effective, set “1” to the protecting bit corresponding to the area to protect. By clearing this bit to
“0”, the protection can be released (see “Chapter 24 Flash Memory Operation” for how to program.)
● FLASH protection/ ROM data protection/ DSU protection
Various protecting functions
- Flash Protection
well.
- DSU Protection
The protecting bit can be monitored with FLCS register.
a) Operation mode: Valid in single or single boot mode.
b) ROM division: The entire ROM area is divided into 4 areas. Protection can be set for each area.
d) Area attribution: Defines area as protected or normal (area without protection).
- ROM data Protection
25.1 Overview
25.2 Features
25.3 Protecting Functions
FLASH protection
ROM
protection
DSU protection
It protects data in FLASH memory by prohibiting accidental rewriting and deletion.
This function covers the area where protecting bit is set.
25.3.1
It prevents operand of FLASH data from being read incorrectly.
Area attribution is specified with protecting bit and the ROMSEC register.
* Deleting protection bit and clearing the ROMSEC register and the DSUSEC register are under protection as
It prevents incorrect program analysis using DSU.
Item
DSU protect function for prohibiting the use of DSU (DSU-Probe) are built into the TMP19A44. The read
protect functions specifically include the following:
The ROM protect function for designating the internal ROM (flash) area as a read-protected area and the
Flash Protection
data
• Flash protection
• ROM data protection
• DSU protection
Yes
Yes
(with restriction
at deletion)
Yes
-
protecting bit
Use of
-
Yes
(with
restriction at
clearing)
-
ROMSEC
register
Use of
TMP19A44 (rev1.3) 25-1
-
-
(with restriction
at clearing)
Yes
-
DSUSEC
register
Use of
- Prohibits Flash operation (Chip/Block deletion, page writing)
- Prohibits ROM reading
- Controls data deletion at protecting bit deletion
- Prohibits clearing register used for ROM data protection
- Prohibits clearing register used for DSU protection
- Prohibits clearing error flag
- Prohibits break.
- Prohibits trace (including memory store)
TMP19A44
Function
2010-04-01