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AT89C51RC2-3CSIM 데이터시트(PDF) 97 Page - ATMEL Corporation

부품명 AT89C51RC2-3CSIM
상세설명  Microcontroller with 16K/32K Bytes Flash
PDF  127 Pages
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제조업체  ATMEL [ATMEL Corporation]
홈페이지  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C51RC2-3CSIM 데이터시트(HTML) 97 Page - ATMEL Corporation

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AT89C51RB2/RC2
4180C–8051–12/03
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 and finally erase the Software Security Bits
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 performance’).
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 the web site.
Communication Initialization
The host initializes the communication by sending a ’U’ character to help the bootloader
to compute the baudrate (autobaud).
Figure 40. Initialization
Host
Bootloader
"U"
Performs Autobaud
Init Communication
If (not received "U")
"U"
Communication Opened
Else
Sends Back ‘U’ Character



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