AT89C51RD2-RLRIM Atmel, AT89C51RD2-RLRIM Datasheet - Page 104
AT89C51RD2-RLRIM
Manufacturer Part Number
AT89C51RD2-RLRIM
Description
IC MCU FLASH 8051 EEP 64K 44VQFP
Manufacturer
Atmel
Series
89Cr
Datasheet
1.ATWEBDVK-02RC.pdf
(137 pages)
Specifications of AT89C51RD2-RLRIM
Core Processor
8051
Core Size
8-Bit
Speed
60MHz
Connectivity
SPI, UART/USART
Peripherals
POR, PWM, WDT
Number Of I /o
34
Program Memory Size
64KB (64K x 8)
Program Memory Type
FLASH
Ram Size
2K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Oscillator Type
External
Operating Temperature
-40°C ~ 85°C
Package / Case
44-TQFP, 44-VQFP
For Use With
AT89STK-11 - KIT STARTER FOR AT89C51RX2
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Data Converters
-
Other names
AT89C51RD2RLRIMTR
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24.8.3
24.9
24.9.1
24.9.2
24.9.3
104
Flow Description
AT89C51RD2/ED2
Checksum Error
Overview
Communication Initialization
Autobaud Performances
The Full Chip Erase does not affect the bootloader.
When a checksum error is detected, send ‘X’ followed with CR&LF.
An initialization step must be performed after each Reset. After microcontroller reset, the boot-
loader waits for an autobaud sequence (see section ‘Autobaud Performances’).
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
web site.
The host initializes the communication by sending a ’U’ character to help the bootloader to com-
pute the baudrate (autobaud).
Figure 24-7. Initialization
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 program 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 AT89C51RD2/ED2 to establish the baud rate. Table show the
autobaud capability.
Table 24-8.
Frequency
(MHz)
Baudrate (kHz)
2400
• SBV = FCh
• SSB = FFh
Autobaud Performances
Communication Opened
Init Communication
Else
If (Not Received "U")
1.8432
Host
OK
OK
2
2.4576
OK
OK
3
"U"
3.6864
"U"
OK
OK
4
Performs Autobaud
Sends Back “U” Character
OK
5
Bootloader
OK
4235K–8051–05/08
6
7.3728
OK
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