tmp19a44fda TOSHIBA Semiconductor CORPORATION, tmp19a44fda Datasheet - Page 588

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

Flash Memory Operation
24.2 Operation Mode
Single chip mode
Single boot mode
Operation mode
Normal mode
User boot mode
This device has three operation modes including the mode not to use the internal flash memory.
Among the flash memory operation modes listed in the above table, the User Boot mode and the Single
Boot mode are the programmable modes. These two modes, the User Boot mode and the Single Boot mode,
are referred to as "Onboard Programming" modes where onboard rewriting of internal flash memory can be
made on the user's card.
After reset is cleared, it starts up from the internal flash memory.
In this operation mode, two different modes, i.e., the mode to execute user application programs
and the mode to rewrite the flash memory onboard the user’s card, are defined. The former is
referred to as "normal mode" and the latter "user boot mode."
The user can uniquely configure the system to switch between these two modes.
For example, the user can freely design the system such that the normal mode is selected when
the port "00" is set to "1" and the user boot mode is selected when it is set to "0."
The user should prepare a routine as part of the application program to make the decision on the
selection of the modes.
After reset is cleared, it starts up from the internal Boot ROM (Mask ROM). In the Boot ROM,
an algorithm to enable flash memory rewriting on the user’s set through the serial port of this
device is programmed. By connecting to an external host computer through the serial port, the
internal flash memory can be programmed by transferring data in accordance with predefined
protocols.
Table 24.1 Operation Modes
TMP19A44 (rev1.3)24-3
Operation details
TMP19A44
2010-04-01