AT89C51CC02 Atmel Corporation, AT89C51CC02 Datasheet - Page 4

• Manufacturer Part Number: AT89C51CC02
• Manufacturer: Atmel Corporation

Specifications of AT89C51CC02

• Flash (kbytes): 16 Kbytes
• Max. Operating Frequency: 40 MHz
• Cpu: 8051-12C
• Max I/o Pins: 20
• Uart: 1
• Can: 1
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 62.5
• Sram (kbytes): 0.5
• Eeprom (bytes): 2048
• Self Program Memory: API
• Operating Voltage (vcc): 3.0 to 5.5
• Timers: 4
• Isp: UART/CAN
• Watchdog: Yes

Mapping and Default
Value of Hardware
Security Byte
Security
4
T89C51CC02 CAN Bootloader
The 4 Most Significant Bit (MSB) of the Hardware Byte can be read/written by software (this area
is called Fuse bits). The 4 Least Significant Bit (LSB) can only be read by software and written
by hardware in parallel mode (with parallel programmer devices).
Note:
The bootloader has Software Security Byte (SSB) to protect itself from user access or ISP
access.
The Software Security Byte (SSB) protects from ISP access. The command "Program Software
Security Bit" can only write a higher priority level.
There are three levels of security:
•
•
•
Only a full chip erase command can reset the software security bits.
level 0: NO_SECURITY (FFh)
This is the default level.
From level 0, one can write level 1 or level 2.
level 1: WRITE_SECURITY (FEh)
In this level it is impossible to write in the Flash memory, BSB and SBV.
The Bootloader returns ID_ERROR message.
From level 1, one can write only level 2.
level 2: RD_WR_SECURITY (FCh)
Level 2 forbids all read and write accesses to/from the Flash memory.
The Bootloader returns ID_ERROR message.
Flash/EEPROM
Fuse bit
BSB & SBV & EB Any access allowed
SSB
Manufacturer info Read only access allowed
Bootloader info
Erase block
Full-chip erase
Blank Check
Bit Position
U: Unprogram = 1
P: Program = 0
7
6
5
4
3
2
1
0
X2B
BLJB
Reserved
Reserved
Reserved
LB2
LB1
LB0
Mnemonic
Level 0
Any access allowed
Any access allowed
Any access allowed
Read only access allowed
Allowed
Allowed
Allowed
Default Value Description
U
P
U
U
U
P
U
U
To start in x1 mode
To map the boot area in code area between F800h-FFFFh
To lock the chip (see datasheet)
Level 1
Read only access allowed
Read only access allowed
Read only access allowed
Write level2 allowed
Read only access allowed
Read only access allowed
Not allowed
Allowed
Allowed
Level 2
All access not allowed
All access not allowed
All access not allowed
Read only access allowed
Read only access allowed
Read only access allowed
Not allowed
Allowed
Allowed
4208D–CAN–03/08