AT89LP51RC2 Atmel Corporation, AT89LP51RC2 Datasheet - Page 207
AT89LP51RC2
Manufacturer Part Number
AT89LP51RC2
Description
Manufacturer
Atmel Corporation
Specifications of AT89LP51RC2
Flash (kbytes)
32 Kbytes
Max. Operating Frequency
20 MHz
Cpu
8051-1C
Max I/o Pins
42
Spi
1
Twi (i2c)
1
Uart
1
Adc Channels
7
Adc Resolution (bits)
10
Adc Speed (ksps)
153.8
Sram (kbytes)
1.375
Self Program Memory
API
Operating Voltage (vcc)
2.4 to 5.5
Timers
4
Isp
SPI/OCD/UART
Watchdog
Yes
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24.5.4.2
24.5.4.3
24.5.5
24.5.5.1
24.5.5.2
3722A–MICRO–10/11
Flow Description
Full Chip Erase
Checksum Error
Overview
Communication Initialization
Table 24-18. Software Security Byte Behavior
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, ‘X’ is sent 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
communication is initialized, the protocol depends on the record type requested by the host.
FLIP, a software utility to implement bootloader 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 baud rate (autobaud).
Figure 24-11. Initialization
Manufacturer Info
• BSB = FFh
• SBV = FCh
• SSB = FFh
Full Chip Erase
Bootloader Info
Blank Check
BSB & SBV
Erase Block
Fuse Bit
Flash
SSB
Communication Opened
Init Communication
Else
If (Not Received "U")
Host
Read-only access allowed
Read-only access allowed
Any access allowed
Any access allowed
Any access allowed
Any access allowed
Allowed
Allowed
Allowed
Level 0
AT89LP51RB2/RC2/IC2 Preliminary
Read-only access allowed
Read-only access allowed
Read-only access allowed
Read-only access allowed
Read-only access allowed
Write level 2 allowed
Not allowed
"U"
Allowed
Allowed
Level 1
"U"
“Autobaud Performance”
Sends Back “U” Characte
Performs Autobaud
Read-only access allowed
Read-only access allowed
Read-only access allowed
Any access not allowed
Any access not allowed
Any access not allowed
Bootloader
Not allowed
Level 2
Allowed
Allowed
). After the
207
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