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T89C51RD2-RDTIL 数据表(PDF) 67 Page - ATMEL Corporation

部件名 T89C51RD2-RDTIL
功能描述  0 to 40 MHz Flash Programmable 8-bit Microcontroller
PDF  104 Pages
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制造商  ATMEL [ATMEL Corporation]
网页  http://www.atmel.com
标志 ATMEL - ATMEL Corporation

T89C51RD2-RDTIL 数据表(HTML) 67 Page - ATMEL Corporation

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67
T89C51RD2
4243G–8051–05/03
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
feature requires that an initial character (an uppercase U) be sent to the T89C51RD2 to
establish the baud rate. Table 39 shows the autobaud capability.
Table 39. Autobaud Performances (Bootloader Revision 2.4)
Frequency (MHz)
Baudrate (bit/s)
1.8432
2
2.4576
3
3.6864
4
5
6
7.3728
8
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
OK
38400
-
OK
-
-
OK
OK
OK
OK
OK
OK
57600
-
-
-
-
OK
-
-
-
OK
-
115200
-
----
-
-
-
OK
-
Frequency (MHz)
Baudrate (bit/s)
10
11.0592
12
14.318
14.746
16
20
24
26.6
32
4800
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
OK
57600
-
OK
-
OK
OK
OK
OK
OK
OK
115200
-
OK
-
OK
-
-
-
-
OK



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