AT89C5131A-L Atmel Corporation, AT89C5131A-L Datasheet - Page 21

• 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 the
Device to a Blank Check
Command
Programming
Configuration
Information
Request from Host
Answers From
Bootloader
4287E–USB–04/08
The Host controller send a GET_STATUS request to the device. Once internal blank check has
been completed, the device sends its status.
•
•
The flow described below allows the user to program Configuration Information regarding the
bootloader functionality.
•
Take care that the Program Fuse bit command programs the 4 Fuse bits at the same time.
To start the programming operation, the Host sends DFU_DNLOAD request with the Write com-
mand in the data field (6 bytes).
The device has two possible answers to a DFU_GETSTATUS request:
•
•
If the device status is “OK”:
the device memory is then blank and the device waits the next Host request.
If the device status is “errCHECK_ERASED”:
the device memory is not blank. The device waits for an DFU_UPLOAD request to send the
first address where the byte is not 0xFF.
Boot Process Configuration:
–
–
–
–
If the chip is protected from program access, a “err_WRITE” status is returned to the Host.
Otherwise, the device status is “OK“.
BSB
SBV
P1_CF, P3_CF and P4_CF
Fuse bits (BLJB, X2 and OSCON bits) (see section “Mapping and Default Value of
Hardware Security Byte”)
Id_write_command
Command
Identifier
04h
SETUP
OUT
IN
data[0]
01h
02h
data[1]
AT89C5131A USB Bootloader
00h
01h
02h
03h
04h
05h
06h
00h
Write_command (6 bytes)
DFU_DNLOAD
ZLP
data[2]
Value
Value
data[3]
data[4]
Write value in BSB
Write value in SBV
Write P1_CF
Write P3_CF
Write P4_CF
Write value in SSB
Write value in EB
Write value in Fuse
(HSB)
Description
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