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AT89C51ED2-RDTIM bảng dữ liệu(PDF) 107 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) 107 Page - ATMEL Corporation

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107
AT89C51RD2/ED2
4235E–8051–04/04
Autobaud Performances
The ISP feature allows a wide range of baud rates in the user application. It is also
adaptable to a wide range of oscillator frequencies. This is accomplished by measuring
the bit-time of a single bit in a received character. This information is then used to pro-
gram the baud rate in terms of timer counts based on the oscillator frequency. The ISP
f eature requi res that an i n i ti a l c harac te r (an upperc a s e U) be sent t o t h e
AT89C51RD2/ED2 to establish the baud rate. Table show the autobaud capability.
Command Data Stream
Protocol
All commands are sent using the same flow. Each frame sent by the host is echoed by
the bootloader.
Table 74. Autobaud Performances
Frequency (MHz)
Baudrate (kHz)
1.8432
2
2.4576
3
3.6864
4
5
6
7.3728
2400
OK
OK
OK
OK
OK
OK
OK
OK
OK
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
-
-
-
-



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