at89c5131 ATMEL Corporation, at89c5131 Datasheet - Page 43

• Manufacturer Part Number: at89c5131
• Description: 8-bit Flash Microcontroller With Full Speed Usb Device At89c5131
• Manufacturer: ATMEL Corporation

In-System
Programming (ISP)
Flash Programming and
Erasure
42
AT89C5131
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:
•
•
Note:
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.
There are three methods for programming the Flash memory:
•
•
•
Figure 20. Flash Memory Mapping
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.
Once the chip is mounted on the PCB, it can be programmed by serial mode via the
USB bus.
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 Security Byte”.
The FM0 can be programmed also by the parallel mode using a programmer.
[SBV]00h
1. The user can also program his own bootloader in FM1.
7FFFh
0000h
Flash Memory
16/ 32K Bytes
Custom
Bootloader
FM0
F400h
FM1 Mapped between F400h and FFFFh
when API Called
3K Bytes IAP
Bootloader
FM1
FFFFh
4136C–USB–04/05
(1)