tmp19a43fd TOSHIBA Semiconductor CORPORATION, tmp19a43fd Datasheet - Page 27

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

3.3
Single Boot Mode
TMP19A43FDXBG on-chip boot ROM. This boot ROM is a masked ROM. When Single Boot mode is
selected upon reset, the boot ROM is mapped to the address region including the interrupt vector table while
the flash memory is mapped to an address region different from it.
TMP19A43FDXBG is connected to an external host controller. Via this serial link, a programming routine is
downloaded from the host controller to the TMP19A43FDXBG on-chip RAM. Then, the flash memory is re-
programmed by executing the programming routine. The host sends out both commands and programming
data to re-program the flash memory.
contents of the flash memory, the validity of the application’s password is checked before a programming
routine is downloaded into the on-chip RAM. If password matching fails, the transfer of a programming
routine itself is aborted.
globally disabled in Single Boot mode while the flash memory is being erased or programmed. In Single
Boot mode, the boot-ROM programs are executed in Normal mode.
corruption during subsequent Single-Chip (Normal mode) operations. For a detailed description of the erase
and program sequence, refer to On-Board Programming and Erasure.
In Single Boot mode, the flash memory can be re-programmed by using a program contained in the
Single Boot mode allows for serial programming of the flash memory. Channel 0 of the SIO (SIO0) of the
Communications between the SIO0 and the host must follow the protocol described later. To secure the
As in the case of User Boot mode, all interrupts including the nonmaskable (NMI) interrupt must be
Once re-programming is complete, it is recommended to protect relevant flash blocks from accidental
TMP19A43 (rev2.0)3-13
Flash Memory Operation
TMP19A43