AT89LP51ED2-20MU Atmel, AT89LP51ED2-20MU Datasheet - Page 199

• 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

24.4.2.9
24.4.2.10
3714A–MICRO–7/11
Reading the User/Atmel Signature
Reading the User Fuses/Hardware Security Bits
The following procedure is used to read the User or Atmel Signature space and is summarized
in
The following procedure is used to read the User Fuses or Hardware
is summarized in
Figure 24-5. Reading Procedure
Note:
• Map the Signature space by writing 02H to FCON register
• Read one byte in Accumulator by executing MOVC A,@A+DPTR where A+DPTR is 0000–
• Clear FCON to unmap the Signature space
• Map the User Fuses/Hardware Security space by writing 04H in FCON register
• Read one byte in Accumulator by executing MOVC A,@A+DPTR where A+DPTR is 0000–
• Clear FCON to unmap the User Fuses/Hardware Security
Figure
01FFH for the User Signature and 0200–027FH for the Atmel Signature
007FH for the User Fuses and 0080–00FFH for the Hardware Security
aa = 00B for the User Application Code
aa = 01B for the User/Atmel Signature
aa = 10B for the User Fuses/Hardware Security
24-5:
Figure
24-5:
AT89LP51RD2/ED2/ID2 Preliminary
Exec: MOVC A, @A+DPTR
Flash Spaces Reading
Flash Spaces Mapping
FCON = 00000aa0
DPTR = Address
FCON = 00h
Clear Mode
Data Read
ACC = 0
Security
space and
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