tmp19a43fd TOSHIBA Semiconductor CORPORATION, tmp19a43fd Datasheet - Page 49

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

3.4 On-board Programming of Flash Memory (Rewrite/Erase)
Automatic page program
Automatic chip erase
Automatic block erase
Write protect
Protect function
In on-board programming, the CPU is to execute software commands for rewriting or erasing the flash memory.
The rewrite/erase control program should be prepared by the user beforehand. Because the flash memory
content cannot be read while it is being written or erased, it is necessary to run the rewrite/erase program from
the internal RAM or from an external memory device after shifting to the user boot mode. In this section, flash
memory addresses are represented in virtual addresses unless otherwise noted.
Major functions
3.4.1
Except for some functions, writing and erasing flash memory data are in accordance with the standard
JEDEC commands. In writing or erasing, use the SW command of the CPU to enter commands to the
flash memory. Once the command is entered, the actual write or erase operation is automatically
performed internally.
Note that addressing of operation commands is different from the case of standard commands due to the
specific interface arrangements with the CPU as detailed operation of the user boot mode and RAM
transfer mode is described later. Also note that the flash memory is written in 32-bit blocks. So, 32-bit
(word) data transfer commands must be used in writing the flash memory.
(1) Block configuration
Flash Memory
When all blocks are set for protection, the entire protection function is automatically
enabled.
By writing a 4-bit protection code, the write or erase function can be individually inhibited
for each block.
Writes data automatically.
Erases the entire area of the flash memory automatically.
Erases a selected block automatically. (128 kB at a time)
The write or erase function can be individually inhibited for each block (of 128 kB).
Fig. 3-4 Block Configuration of Flash Memory
0xBFC7_FFFF
0xBFC0_0000
Table 3-5 Flash Memory Functions
TMP19A43 (rev2.0)3-35
128 kB
128 kB
128 kB
128 kB
Description
Flash Memory Operation
128 words
128 words
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