AT89C5131A-M Atmel Corporation, AT89C5131A-M Datasheet - Page 41

• Manufacturer Part Number: AT89C5131A-M
• Manufacturer: Atmel Corporation

Specifications of AT89C5131A-M

• Flash (kbytes): 32 Kbytes
• Max. Operating Frequency: 48 MHz
• Cpu: 8051-12C
• Max I/o Pins: 34
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 1
• Twi (i2c): 1
• Uart: 1
• Sram (kbytes): 1.25
• Eeprom (bytes): 1024
• Self Program Memory: API
• Operating Voltage (vcc): 2.7 to 5.5
• Timers: 4
• Isp: UART/USB
• Watchdog: Yes

4337K–USB–04/08
Table 9-3.
After programming the part by ISP, the BSB must be cleared (00h) in order to allow the applica-
tion to boot at 0000h.
The content of the Software Security Byte (SSB) is described in
To assure code protection from a parallel access, the HSB must also be at the required level.
The two lock bits provide different levels of protection for the on-chip code and data, when pro-
grammed as shown to Table 9-5.
Table 9-4.
01
00
05
30
31
60
61
7
-
Number
Address
1-0
Bit
7
6
5
4
3
2
Software Registers
Software Security Byte (SSB)
6
-
Mnemonic
SBV
BSB
SSB
–
–
–
–
LB1-0
Mnemonic
Bit
-
-
-
-
-
-
5
-
Description
Reserved
Do not clear this bit.
Reserved
Do not clear this bit.
Reserved
Do not clear this bit.
Reserved
Do not clear this bit.
Reserved
Do not clear this bit.
Reserved
Do not clear this bit.
User Memory Lock Bits
See Table 9-5
Description
Software Boot Vector
Boot Status Byte
Software Security Byte
Copy of the Manufacturer
Code
Copy of the Device ID #1:
Family Code
Copy of the Device ID #2:
Memories
Copy of the Device ID #3:
Name
4
-
3
-
AT89C5130A/31A-M
Default value
FFh
0FFh
FFh
58h
D7h
F7h
DFh
2
-
Table 9-4
–
–
–
Atmel
C51 X2, Electrically
Erasable
AT89C5130A/31A-M 32
Kbyte
AT89C5130A/31A-M 32
Kbyte, revision 0
LB1
and
1
Table 9-5.
LB0
0
41