TMP19A43FD Datasheet, PDF (28/105 Pages) Toshiba Semiconductor – 32-bit RISC Microprocessor

TMP19A43
Boot Mode
(2-A) General Procedure: Using the Program in the On-Chip Boot ROM
(1) The flash block containing the older version of the program code need not be erased before
executing the programming routine. Since a programming routine and programming data are
transferred via the SIO0, the SIO0 must be connected to a host controller. Prepare a programming
routine on the host controller.
TMP19A43FDXBG
Boot ROM
Flash Memory
Host Controller
I/O
New Application
Program Code
(a) Programming Routine
SIO0
Old Application Program
Code (or Erased State)
RAM
(2) Reset the TMP19A43FDXBG with the mode setting pins held at appropriate logic values, so that
the CPU re-boots from the on-chip boot ROM. The 12-byte password transferred from the host
controller is first compared to the contents of special flash memory locations. (If the flash block
has already been erased, the password is 0xFFFF.)
TMP19A43FDXBG
Boot ROM
Flash Memory
Old Application Program
Code (or Erased State)
Host Controller
I/O
New Application
Program Code
(a) Programming Routine
SIO0
0 → 1 RESET
RAM
Conditions for
entering Single Boot
mode
TMP19A43 (rev2.0)3-14
Flash Memory Operation