AT89C5131A-M Atmel Corporation, AT89C5131A-M Datasheet - Page 125
AT89C5131A-M
Manufacturer Part Number
AT89C5131A-M
Description
Manufacturer
Atmel Corporation
Datasheets
1.AT89C5130A-M.pdf
(188 pages)
2.AT89C5130A-M.pdf
(4 pages)
3.AT89C5130A-M.pdf
(34 pages)
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
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Figure 21-6. Endpoint FIFO Configuration
21.3.2
21.3.3
21.4
4337K–USB–04/08
Bulk/Interrupt Transactions
Read Data FIFO
Write Data FIFO
Endpoint 0
Endpoint 6
The read access for each OUT endpoint is performed using the UEPDATX register.
After a new valid packet has been received on an Endpoint, the data are stored into the FIFO
and the byte counter of the endpoint is updated (UBYCTLX and UBYCTHX registers). The firm-
ware has to store the endpoint byte counter before any access to the endpoint FIFO. The byte
counter is not updated when reading the FIFO.
To read data from an endpoint, select the correct endpoint number in UEPNUM and read the
UEPDATX register. This action automatically decreases the corresponding address vector, and
the next data is then available in the UEPDATX register.
The write access for each IN endpoint is performed using the UEPDATX register.
To write a byte into an IN endpoint FIFO, select the correct endpoint number in UEPNUM and
write into the UEPDATX register. The corresponding address vector is automatically increased,
and another write can be carried out.
Warning 1: The byte counter is not updated.
Warning 2: Do not write more bytes than supported by the corresponding endpoint.
Bulk and Interrupt transactions are managed in the same way.
UEPSTA0
UEPSTA6
UBYCTH0
UBYCTH6
UEPCON0
UEPCON6
UBYCTL0
UBYCTL6
UEPDAT0
UEPDAT6
UEPNUM
0
1
2
3
4
5
6
X
AT89C5130A/31A-M
UEPSTAX
UBYCTHX
SFR registers
UEPCONX
UBYCTLX
UEPDATX
125
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