AT89C5131A-L Atmel Corporation, AT89C5131A-L Datasheet - Page 23

• 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

Answers from
Bootloader
Erasing the Flash
Request from Host
4287E–USB–04/08
The device has two possible answers to a DFU_GETSTATUS request:
•
•
The flow described below allows the user to erase the Flash memory.
Two modes of Flash erasing are possible:
•
•
The Full Chip erase command erases the whole Flash (32 Kbytes) and sets some Configuration
Bytes at their default values:
•
•
•
The Block erase command erases only a part of the Flash.
Three Blocks are defined in the AT89C5131A:
•
•
•
To start the erasing operation, the Host sends a DFU_DNLOAD request with a Write Command
in the data field (2 bytes).
If the chip is protected from program access, an “err_VENDOR” status is returned to the
Host.
Otherwise, the device status is “OK“. The Host can send a DFU_UPLOAD request to the
device in order the value of the requested field.
Full Chip erase
Block erase
BSB = FFh
SBV = FFh
SSB = FFh (NO_SECURITY)
block0 (From 0000h to 1FFFh)
block1 (From 2000h to 3FFFh)
block2 (From 4000h to 7FFFh)
Id_write_command
Command
Identifier
04h
SETUP
IN
OUT
data[0]
00h
data[1]
AT89C5131A USB Bootloader
FFh
00h
20h
40h
Byte value (1 byte)
DFU_UPLOAD
ZLP
data[2]
data[3]
data[4]
Erase block0 (0K to 8K)
Erase block1 (8K to 16K)
Erase block2 (16K to 32K)
Full chip Erase (bits at
FFh)
Description
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