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AT89C51ED2-RDTUM データシート(PDF) 105 Page - ATMEL Corporation

部品番号 AT89C51ED2-RDTUM
部品情報  8-bit Flash Microcontroller
PDF  137 Pages
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メーカー  ATMEL [ATMEL Corporation]
ホームページ  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C51ED2-RDTUM データシート(HTML) 105 Page - ATMEL Corporation

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105
4235K–8051–05/08
AT89C51RD2/ED2
24.9.4
Command Data Stream Protocol
All commands are sent using the same flow. Each frame sent by the host is echoed by the
bootloader.
Figure 24-8. Command Flow
4800
OK
-
OK
OK
OK
OK
OK
OK
OK
9600
OK
-
OK
OK
OK
OK
OK
OK
OK
19200
OK
-
OK
OK
OK
-
-
OK
OK
38400
-
-
OK
OK
-
OK
OK
OK
57600
-
-
-
-
OK
-
-
-
OK
115200
-
-
-
-
-
-
-
-
OK
Frequency
(MHz)
Baudrate (kHz)
8
10
11.0592
12
14.746
16
20
24
26.6
2400
OK
OK
OK
OK
OK
OK
OK
OK
OK
4800
OK
OK
OK
OK
OK
OK
OK
OK
OK
9600
OK
OK
OK
OK
OK
OK
OK
OK
OK
19200
OK
OK
OK
OK
OK
OK
OK
OK
OK
38400
-
-
OK
OK
OK
OK
OK
OK
OK
57600
-
-
OK
-
OK
OK
OK
OK
OK
115200
-
-
OK
-
OK
-
-
-
-
Table 24-8.
Autobaud Performances (Continued)
Frequency
(MHz)
Baudrate (kHz)
1.8432
2
2.4576
3
3.6864
4
5
6
7.3728
Bootloader
":"
Sends First Character of the
Frame
If (not received ":")
Sends Frame (made of 2 ASCII
Gets Frame, and Sends Back Echo
for Each Received Byte
Host
Else
":"
Sends Echo and Start
Reception
Characters Per Byte)
Echo Analysis



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