AT89C5131A-RDTUL datasheet(43/186 Pages) ATMEL

43 / 186 page

AT89C5131A-L

4338F–USB–08/07

In-System

Programming (ISP)

With the implementation of the User Space (FM0) and the Boot Space (FM1) in Flash

technology the AT89C5131 allows the system engineer the development of applications

with a very high level of flexibility. This flexibility is based on the possibility to alter the

customer program at any stages of a product’s life:

•

Before mounting the chip on the PCB, FM0 flash can be programmed with the

application code. FM1 is always preprogrammed by Atmel with a USB bootloader.(1)

•

Once the chip is mounted on the PCB, it can be programmed by serial mode via the

USB bus.

Note:

1. The user can also program his own bootloader in FM1.

This ISP allows code modification over the total lifetime of the product.

Besides the default Bootloaders Atmel provide customers all the needed Application-

Programming-Interfaces (API) which are needed for the ISP. The API are located in the

Boot memory.

This allow the customer to have a full use of the 32-Kbyte user memory.

Flash Programming and

Erasure

There are three methods for programming the Flash memory:

•

The Atmel bootloader located in FM1 is activated by the application. Low level API

routines (located in FM1)will be used to program FM0. The interface used for serial

downloading to FM0 is the USB. API can be called also by user’s bootloader located

in FM0 at [SBV]00h.

•

A further method exist in activating the Atmel boot loader by hardware activation.

See the Section “Hardware Registers”.

•

The FM0 can be programmed also by the parallel mode using a programmer.

Figure 22. Flash Memory Mapping

F400h

7FFFh

32K Bytes

Flash Memory

3K Bytes IAP

Bootloader

FM0

FM1

Custom

Bootloader

[SBV]00h

FFFFh

FM1 Mapped between F400h and FFFFh

when API Called

0000h

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