AT89LP51ED2-20MU Atmel, AT89LP51ED2-20MU Datasheet - Page 210

• Manufacturer Part Number: AT89LP51ED2-20MU
• Description: 8-bit Microcontrollers - MCU 64KB 20MHz 2.4V-5.5V
• Manufacturer: Atmel

Specifications of AT89LP51ED2-20MU

• Rohs: yes
• Core: 8051
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 20 MHz
• Program Memory Size: 64 KB
• Data Ram Size: 256 B
• On-chip Adc: Yes
• Operating Supply Voltage: 2.4 V to 5.5 V
• Operating Temperature Range: - 40 C to + 85 C
• Package / Case: VQFN-44
• Mounting Style: SMD/SMT
• Data Rom Size: 4 KB
• Interface Type: 2-Wire, SPI, UART
• Number Of Programmable I/os: 36
• Number Of Timers: 3
• Processor Series: AT89x
• Program Memory Type: Flash
• Factory Pack Quantity: 360

24.5.5.4
Figure 24-12. Command Flow
24.5.6
Figure 24-13. Write/Program Flow
210
AT89LP51RD2/ED2/ID2 Preliminary
COMMAND FINISHED
Write/Program Commands Description
Wait COMMAND_OK
Command Data Stream Protocol
Sends First Character of the
Frame
Sends Frame (made of 2 ASCII
Characters Per Byte)
Echo Analysis
Send Write Command
OR
Host
Host
OR
COMMAND ABORTED
Wait Checksum Error
COMMAND ABORTED
Wait Security Error
All commands are sent using the same flow. Each frame sent by the host is echoed by the
bootloader.
This flow is common to the following frames:
• Flash/EEPROM Programming Data Frame
• EOF or Atmel Frame (only Programming Atmel Frame)
• Config Byte Programming Data Frame
• Baud Rate Frame
’X’ & CR & LF
Write Command
’P’ & CR & LF
’.’ & CR & LF
":"
":"
Send Checksum Error
Send Security Error
Gets Frame, and Sends Back Echo
for Each Received Byte
Else
If (not received ":")
Sends Echo and Start
Reception
Bootloader
Bootloader
Wait Write Command
Send COMMAND_OK
Wait Programming
Checksum Error
NO_SECURITY
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