SH7041A datasheet(722/923 Pages) RENESAS

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22.2.3

Onboard Program Mode

Boot mode

;;

;

;;

New application

program

New application

program

New application

program

Program

LSI

Boot program

LSI

Boot program

Flash memory

Application

version

(old version)

Boot program

Flash memory

Application

version

(old version)

RAM

Flash memory

RAM

SCI1

HOST

Boot program area

3. Initializing the flash memory

To initialize (to H'FF) the flash memory, execute

the erase program located in the boot program

area (within RAM). During the boot mode, the

entire flash memory is erased, regardless of blocks.

4. Writing the new application program

Execute the program transferred to RAM from the

host and write the new application program located

at the transfer destination to the flash memory.

Erasing the

flash memory

New application

program

Program execution state

1. Initial state

The old program version or data remains written

in the flash memory. The user should prepare the

programming control program and new

application program beforehand in the host.

2. Programming control program transfer

When boot mode is entered, the boot program in

the LSI (originally incorporated in the chip) is

started and the programming control program in

the host is transferred to RAM via SCI

communication. The boot program required for

flash memory erasing is automatically transferred

to the RAM boot program area.

Figure 22.3 Boot Mode

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