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AT89C51ED2-RDTIM bảng dữ liệu(PDF) 106 Page - ATMEL Corporation

tên linh kiện AT89C51ED2-RDTIM
Giải thích chi tiết về linh kiện  8-bit Flash Microcontroller
PDF  137 Pages
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nhà sản xuất  ATMEL [ATMEL Corporation]
Trang chủ  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C51ED2-RDTIM bảng dữ liệu(HTML) 106 Page - ATMEL Corporation

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AT89C51RD2/ED2
4235E–8051–04/04
Full Chip Erase
The ISP command "Full Chip Erase" erases all user Flash memory (fills with FFh) and
sets some bytes used by the bootloader at their default values:
•
BSB = FFh
•
SBV = FCh
•
SSB = FFh
The Full Chip Erase does not affect the bootloader.
Checksum Error
When a checksum error is detected, send ‘X’ followed with CR&LF.
Flow Description
Overview
An initialization step must be performed after each Reset. After microcontroller reset,
the bootloader waits for an autobaud sequence (see section ‘Autobaud Performances’).
When the communication is initialized, the protocol depends on the record type
requested by the host.
FLIP, a software utility to implement ISP programming with a PC, is available from the
Atmel web site.
Communication Initialization
The host initializes the communication by sending a ’U’ character to help the bootloader
to compute the baudrate (autobaud).
Figure 46. Initialization
Host
Bootloader
"U"
Performs Autobaud
Init Communication
If (Not Received "U")
"U"
Communication Opened
Else
Sends Back “U” Character



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