TMP92FD54AI datasheet(12/84 Pages) TOSHIBA

12 / 84 page

2006-01-27

92FD54AI-12

TMP92FD54AI

4.2

Operation Modes

TMP92FD54AI has three operation modes.

Table 4.2.1 Operation modes

Operation Mode Name

Description

Single-Chip Mode

After a reset the device restarts from the internal flash memory.

Single-Chip Mode is further sub-divided into the following two modes: Normal Mode and User Boot Mode.

The means for selecting between these two modes can be set by the user as desired. For example, it can

be set so that if Port 00 = 1, Normal Mode is selected, and if Port 00 = 0, User Boot Mode is selected. The

user application program must in corporate a routine to handle mode switching.

Normal Mode

The user’s application program is executed.

User Boot Mode

The flash memory on the user PCB board is rewritten.

Single Boot Mode

After a Reset the device starts up from the internal boot ROM (the mask ROM). The boot ROM has an

algorithm which allows memory on the user PCB to be rewritten via the device’s serial port. The internal

flash memory can be rewritten by connecting the PCB to the external host via TMP92FD54AI’s serial port

and transferring data using TMP92FD54AI data transfer protocol.

Of the modes listed in the table above, there are two operation modes in which the flash

memory can be programmed: User Boot Mode and Single Boot Mode.

At User Boot Mode (in Single-Chip mode) and Single Boot Mode, the internal flash

memory can be rewritten while mounted on the user PCB. These two modes are collectively

referred to as On-Board Programming Mode.

TMP92FD54AI 数据表(PDF) 12 Page - Toshiba Semiconductor