TMP92FD54AI datasheet(28/84 Pages) TOSHIBA

28 / 84 page

2006-01-27

92FD54AI-28

TMP92FD54AI

(Step 5)

Next, the Rewrite routine in the RAM is executed and writes the new user application

program into the erased area of the flash memory after loading it from the source of

transfer (the controller). When the processor has finished writing the new user

application program, write-protect for the user program area should be turn on.

In the example below the rewrite data is transferred from the same host via the same

SIO as the rewrite routine. However, once normal program operation has started in RAM,

any other data bus and any other transfer source may be used as desired. The user must

design the board hardware and write the rewrite routine accordingly.

(Step 6)

When writing to the device has been completed, turn the power to the board off and

remove the cable connecting the device and host. To execute the new user application

program, turn the power back on again and start the device in Single-Chip Mode (Normal

Mode).

(TMP92FD54AI)

(Controller)

→ 1 RESET

Set for Single-Chip

Mode (Normal

Mode)

Flash memory

RAM

New user

application program

Boot ROM

SIO1

(TMP92FD54AI)

Flash memory

RAM

New user

application program

(Controller)

New user

application program

(I/O)

(a) Rewrite routine

Boot ROM

SIO1

(a) Rewrite routine

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