tmp19a44fda TOSHIBA Semiconductor CORPORATION, tmp19a44fda Datasheet - Page 590

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

TMP19A44
24.2.2
User Boot mode(Single chip mode)
User Boot mode is to use flash memory programming routine defined by users. It is used when
the data transfer buses for flash memory program code on the old application and for serial I/O
are different. It operates at the single chip mode; therefore, a switch from normal mode in which
user application is activated at the single chip mode to User Boot Mode for programming flash is
required. Specifically, add a mode judgment routine to a reset program in the old application.
The condition to switch the modes needs to be set by using the I/O of 19A44 in conformity with
the user’s system setup condition. Also, flash memory programming routine that the user
uniquely makes up needs to be set in the new application. This routine is used for
programming after being switched to User Boot Mode. The execution of the programming
routine must take place while it is stored in the area other than the flash memory since the
data in the internal flash memory cannot be read out during delete/ writing mode. Once
re-programming is complete, it is recommended to protect relevant flash blocks from
accidental writing/ erasing during subsequent Single-Chip (Normal mode) operations. All the
interruption including a non-maskable are inhibited at User Boot Mode.
(1-A) and (1-B) are the examples of programming with routines in the internal flash memory
and in the external memory. For a detailed description of the erase and program sequence,
refer to “On-board Programming of Flash Memory (Rewrite/Erase)”.
Flash Memory Operation
TMP19A44 (rev1.3)24-5
2010-04-01