TMP92FD54AI datasheet(37/84 Pages) TOSHIBA

37 / 84 page

2006-01-27

92FD54AI-37

TMP92FD54AI

(6) Boot program

When the device is turned on in Single Boot Mode, the boot program starts up. These

functions are detailed in the explanations “1, RAM Transfer command” to “4, Auto Chip

Erase & UnProtect

command) on the following pages.

1. RAM Transfer command

RAM transfer refers to the storing of data received from the controller in the

device’s internal RAM. If the transfer terminates normally, the boot program will

start running the user program. The maximum size of the user program is

26Kbytes, and the address at which program execution starts is the RAM storage

start address.

This RAM transfer function allows unique on-board programming by executing a

rewrite program created by the user. In order for on-board programming to be

executed as part of the user program, the flash memory command sequence

described later in Section 4.5 must be used. The RAM transfer command examines

the result of the password matching check before it starts operation. If the

password is found not to match, RAM transfer is not performed. Once the RAM

transfer command has been completed, access to the entire on-chip RAM is free.

2. Flash Memory SUM command

This command calculates the sum of 512 Kbytes of flash memory and returns the

result. There is no operation command available to the boot program which will

enable it to read data from the entire area of the flash memory. Instead, this flash

memory SUM command must be used. Reading SUM enables revision

management of the application program to be carried out.

3. Product Information Read command

This command returns the product name, information about the device’s memory

and various other details. Specifically, this command returns data from a part of

the flash memory area (addresses 08FEF0H to 08FEF3H). Using this data as well

as the above Flash Memory SUM command enables revision management of the

application program to be carried out.

4． Auto Chip Erase & UnProtect

command

This command erases all the blocks of flash memory. Even when protect function is

effective, all the blocks of flash memory are erased and protect function is

initialized. It is not necessary to perform comparison of a password in this

operation.

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