AT89C51RC2-3CSCM View Datasheet(PDF) - Atmel Corporation
Part Name
Description
Manufacturer
AT89C51RC2-3CSCM Datasheet PDF : 127 Pages
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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
AT89C51RB2/RC2 to establish the baud rate. Table 72 shows the autobaud capability.
Table 72. Autobaud Performances
Frequency (MHz)
Baudrate (bit/s)
1.8432
2
2.4576
3
3.6864
4
5
6
7.3728
8
2400
OK
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
38400
-
-
OK
OK
-
OK
OK
OK
57600
-
-
-
-
OK
-
-
-
OK
115200
-
-
-
-
-
-
-
-
OK
Frequency (MHz)
Baudrate (bit/s)
2400
4800
9600
19200
38400
57600
115200
10 11.0592 12 14.318 14.746 16
20
24
26.6
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
OK
OK
OK
-
OK
-
OK
OK
OK
OK
OK
OK
-
OK
-
OK
OK
-
-
-
-
Command Data Stream
Protocol
All commands are sent using the same flow. Each frame sent by the host is echoed by
the bootloader.
98 AT89C51RB2/RC2
4180E–8051–10/06
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