AT89C5131A-L Atmel Corporation, AT89C5131A-L Datasheet - Page 34

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

Specifications of AT89C5131A-L

• 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): 3.0 to 3.6
• Timers: 4
• Isp: UART/USB
• Watchdog: Yes

Reading the Flash Spaces
User
Extra Row
Hardware Security
34
AT89C5131A-L
The following procedure is used to read the User space and is summarized in Figure 20:
•
•
The following procedure is used to read the Extra Row space and is summarized in
Figure 20:
•
•
The following procedure is used to read the Hardware Security space and is summa-
rized in Figure 20:
•
•
Figure 20. Reading Procedure
Map the User space by writing 00h in FCON register.
Read one byte in Accumulator by executing MOVC A, @A+DPTR with A = 0 &
DPTR = 0000h to FFFFh.
Map the Extra Row space by writing 02h in FCON register.
Read one byte in Accumulator by executing MOVC A, @A+DPTR with A = 0 &
DPTR = FF80h to FFFFh.
Map the Hardware Security space by writing 04h in FCON register.
Read the byte in Accumulator by executing MOVC A, @A+DPTR with A = 0 &
DPTR = 0000h.
Exec: MOVC A, @A+DPTR
Flash Spaces Reading
Flash Spaces Mapping
FCON = 00000xx0b
DPTR = Address
Erase Mode
FCON = 00h
Data Read
ACC = 0
4338F–USB–08/07