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AT89C51RC2-3CSIM Arkusz danych(PDF) 98 Page - ATMEL Corporation

Numer części AT89C51RC2-3CSIM
Szczegółowy opis  Microcontroller with 16K/32K Bytes Flash
PDF  127 Pages
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Producent  ATMEL [ATMEL Corporation]
Strona internetowa  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C51RC2-3CSIM Arkusz danych(HTML) 98 Page - ATMEL Corporation

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98
AT89C51RB2/RC2
4180C–8051–12/03
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
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
AT89C51RB2/RC2 to establish the baud rate. Table 72 shows 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 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
-
OKOKOKOKOKOK
OKOK
9600
OK
-
OKOKOKOKOKOK
OKOK
19200
OK
-
OK
OK
OK
-
-
OK
OK
OK
38400
-
-
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
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
OKOKOKOKOKOKOK
OK
38400
-
OK
OK
OK
OK
OK
OK
OK
OK
57600
-
OK
-
OKOKOKOKOK
OK
115200
-
OK
-
OK
OK
----



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