TMP1942FDU Datasheet, PDF (17/106 Pages) Toshiba Semiconductor – 32bit TX System RISC

TMP1942FD
3.2 Operating Modes
The TMP1942FD offers a total of five operating modes, including the one in which the flash
memory is unused.
Operating Mode
Single-Chip Mode
Normal Mode
User Boot Mode
Single Boot Mode
Writer Mode
Table 3.2.1 Operating Modes
Description
After a reset, the TX19 core processor executes out of the on-chip flash memory. Either fast (one-clock)
or interleave mode operation is selected through the INTLV pin when the reset state is released.
Single-Chip mode is further divided into Normal mode in which the user application executes and User
Boot mode which allows re-programming of the flash memory while the TMP1942FD is installed on a
printed circuit board.
The user can freely define how to switch between Normal mode and User Boot mode. For example, the
logic state on, for example, Port 00 can be used to determine whether to put the flash memory in Normal
mode or User Boot mode. The user must include a routine in the application program to test the state of
that port.
After a reset, the TX19 core processor executes out of the on-chip boot ROM (which is a mask
ROM).The boot ROM contains a routine to aid users in performing on-board programming of the flash
memory via a serial port of the TMP1942FD. The serial port is connected to an external host which
transfers new data according to a prescribed protocol.
This mode allows re-programming of the flash memory with a general-purpose EPROM programmer.
Use the programmer and programming adaptor recommended by Toshiba.
The on-chip flash memory can be re-programmed in one of the following three modes: User
Boot mode, Single Boot mode and Writer mode. Of these modes, User Boot mode and Single Boot
mode are collectively referred to as on-board programming modes.
TMP1942FD-16