AT89C51AC2(2005) データシートの表示（PDF） - Atmel Corporation
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AT89C51AC2 Datasheet PDF : 29 Pages
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A/T89C51AC2 UART 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 Serial protocol (see Section “Protocol”, page 9). This process translates serial
communication frames (UART) 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
accesses).
Bootloader Configuration
Configuration and
Manufacturer Information
The following table lists Configuration and Manufacturer byte information used by the
bootloader. 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
Manufacturer
58h
ID1: Family Code
D7h
ID2: Product Name
BBh
ID3: Product Revision
FFh
3
4231C–CAN–03/05
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