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AT89C51ID2-RDTIM Datasheet(PDF) 129 Page - ATMEL Corporation

Part # AT89C51ID2-RDTIM
Description  8-bit Flash Microcontroller
PDF  159 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C51ID2-RDTIM Datasheet(HTML) 129 Page - ATMEL Corporation

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AT89C51ID2
4289A–8051–09/03
Flow Description
Overview
An initialization step must be performed after each Reset. After microcontroller reset,
the bootloader waits for an autobaud sequence ( see section ‘autobaud performance’).
When the communication is initialized the protocol depends on the record type
requested by the host.
FLIP, a software utility to implement ISP programming with a PC, is available from the
Atmel the web site.
Communication Initialization
The host initializes the communication by sending a ’U’ character to help the bootloader
to compute the baudrate (autobaud).
Figure 51. Initialization
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 AT89C51ID2 to
establish the baud rate. Table show the autobaud capability.
Host
Bootloader
"U"
Performs autobaud
Init communication
If (not received "U")
"U"
Communication opened
Else
Sends back U character
Table 94. 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
OKOKOKOK
OKOK
9600
OK
-
OK
OKOKOKOK
OKOK
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



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