AT89C51IC2-RLTIM ATMEL [ATMEL Corporation], AT89C51IC2-RLTIM Datasheet - Page 118

• Manufacturer Part Number: AT89C51IC2-RLTIM
• Description: 8-bit Flash Microcontroller with 2-wire Interface
• Manufacturer: ATMEL [ATMEL Corporation]

Full Chip Erase
Checksum Error
Flow Description
Overview
Communication Initialization
118
AT89C51IC2
The ISP command "Full Chip Erase" erases all User Flash memory (fills with FFh) and
sets some Bytes used by the bootloader at their default values:
•
•
•
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 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.
The host initializes the communication by sending a ’U’ character to help the bootloader
to compute the baudrate (autobaud).
Figure 47. Initialization
BSB = FFh
SBV = FCh
SSB = FFh and finally erase the Software Security Bits
Communication Opened
Init Communication
Else
If (not received "U")
Host
"U"
"U"
Sends Back ‘U’ Character
Performs Autobaud
Bootloader
4301C–8051–06/06