SH7041A datasheet(723/923 Pages) RENESAS

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User program mode

;

;;

;;;

3. Initializing the flash memory

Execute the Programming/erase program in RAM to

initialize (to H'FF) the flash memory. Erase is executed

in block units, but cannot be executed in byte units.

HOST

Programming/erase

control program

New application

program

New application

program

New application

program

LSI

Boot program

Flash memory

FWP verify program

Transfer program

Application program

(old version)

RAM

Boot program

Flash memory

FWP verify program

Transfer program

RAM

SCI

Boot program

Flash memory

FWP verify program

Transfer program

Application program

(old version)

RAM

LSI

Boot program

FWP verify program

Transfer program

RAM

SCI

Programming

control program

;;;

Programming

control program

Programming

control program

Program execution state

New application

program

Flash memory

erase

4. Writing new application program

Next, the new application program in the host is

written into the erased flash memory blocks. Do

not write to unerased blocks.

1. Initial state

The FWP assessment program that confirms that

user program mode has been entered, and the

program that will transfer the programming/erase

control program from flash memory to on-chip

RAM should be written into the flash memory by

the user beforehand. The programming/erase

control program should be prepared in the host

or in the flash memory.

2. Programming/erase control program transfer

When user program mode is entered, user

software confirms this fact, executes transfer

program in the flash memory, and transfers the

programming/erase control program to RAM.

Figure 22.4 User Program Mode

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