AT89C5131A(2004) View Datasheet(PDF) - Atmel Corporation
Part Name
Description
Manufacturer
AT89C5131A Datasheet PDF : 33 Pages
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AT89C5131A USB Bootloader
ISP Communication
Management
The purpose of this process is to manage the communication and its protocol between
the on-chip bootloader and an external device (host). The on-chip bootloader imple-
ments a USB protocol (see section “Protocol”). This process translates serial
communication frames (USB) into Flash memory accesses (read, write, erase...).
User Call Management
Flash Memory Management
Several Application Program Interface (API) calls are available to the application pro-
gram to selectively erase and program Flash pages. All calls are made through a
common interface (API calls) included in the bootloader. The purpose of this process is
to translate the application request into internal Flash memory operations.
This process manages low level access to the Flash memory (performs read and write
access).
Bootloader Configuration
Configuration and
Manufacturer Information
The table below lists Configuration and Manufacturer byte information used by the boot-
loader. This information can be accessed through a set of API or ISP commands.
Mnemonic
Description
Default Value
BSB
Boot Status Byte
FFh
SBV
Software Boot Vector
FCh
SSB
Software Security Byte
FFh
EB
Extra Byte
FFh
P1_CF
Port 1 Configuration
FEh
P3_CF
Port 3 Configuration
FFh
P4_CF
Port 4 Configuration
FFh
Manufacturer
58h
Id1: Family code
D7h
Id2: Product Name
F7h
Id3: Product Revision
DFh
3
4287C–USB–11/04
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