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AT89C5131A Datasheet(PDF) 3 Page - ATMEL Corporation |
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AT89C5131A Datasheet(HTML) 3 Page - ATMEL Corporation |
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3 / 33 page  3 AT89C5131A USB Bootloader 4287C–USB–11/04 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 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. Flash Memory Management 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 |
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