AN2475 datasheet(3/37 Pages) STMICROELECTRONICS

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AN2475

IAP overview

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IAP overview

1.1

Principle

The IAP driver must be programmed by the user in the Flash Bank1 after being remapped in

hardware to address 0x00 (Bank0 is hardware remapped at address 0x80000 for

256 or 512 Kbytes devices and at address 0x200000 for 1 or 2 Mbytes devices).

Note:

For 256K, Bank 0 must be at a 256K boundary (Bank 0 base addresses can be: 0x00,

ox40000, ox80000, etc.).

For 512K, Bank 0 must be at a 512K boundary (Bank 0 base addresses can be: 0x00,

ox80000, ox100000, etc.).

For 1M, Bank 0 must be at a 1M boundary (Bank 0 base addresses can be: 0x00,

0x100000, 0x200000, etc.).

For 2M, Bank 0 must be at a 2M boundary (Bank 0 base addresses can be: 0x00,

0x200000, 0x400000, etc.).

Programming is performed via JTAG using a Flasher toolset.

1.2

Triggering execution of the IAP driver

In this application note, the pin 4 of port 7 connected to the push button (PB3) on the

STR91xFA evaluation board is used as an example. This configuration allows the execution

of the IAP driver. By pressing the push button at reset, the user is able to run the IAP driver

to reprogram the STR91x internal Flash.

It is not mandatory to use the push button; the user can simply enter a signal on this pin with

respect to its corresponding active level.

AN2475 Datasheet(PDF) 3 Page - STMicroelectronics