AT89C5131A-M Atmel Corporation, AT89C5131A-M Datasheet - Page 35

• 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

8.3.6.3
4337K–USB–04/08
Hardware Security
Figure 8-6.
The following procedure is used to program the Hardware Security space and is summarized in
Figure 8-7:
• Set FPS and map Hardware byte (FCON = 0x0C)
• Disable the interrupts.
• Load DPTR at address 0000h.
• Load Accumulator register with the data to load.
• Execute the MOVX @DPTR, A instruction.
• Launch the programming by writing the data sequence 54h followed by A4h in FCON
• Enable the interrupts.
register.
The end of the programming indicated by the FBusy flag cleared.
Flash and Extra Row Programming Procedure
Column Latches Loading
Launch Programming
End Programming
Flash Spaces
Programming
see Figure 8-5
FCON = Axh
Erase Mode
FCON = 00h
FCON = 5xh
Cleared?
Disable IT
Enable IT
FBusy
EA = 0
EA = 1
AT89C5130A/31A-M
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