T89C51RD2-3CSCM View Datasheet(PDF) - Atmel Corporation
Part Name
Description
Manufacturer
T89C51RD2-3CSCM Datasheet PDF : 104 Pages
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T89C51RD2
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)
4800
9600
19200
38400
57600
115200
10
11.0592
12
14.318 14.746
16
20
24
26.6
32
OK
OK
OK
OK
OK
-
-
-
-
-
OK
OK
OK
OK
OK
OK
OK
OK
OK
-
-
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
-
OK
-
OK
OK
OK
OK
OK
OK
-
OK
-
OK
-
-
-
-
OK
67
4243G–8051–05/03
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