UPSD3422E-40U6 STMicroelectronics, UPSD3422E-40U6 Datasheet - Page 155

• Manufacturer Part Number: UPSD3422E-40U6
• Description: MCU 8BIT 8032 64KB FLASH 80TQFP
• Manufacturer: STMicroelectronics
• Series: µPSDr

Specifications of UPSD3422E-40U6

• Core Processor: 8032
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: I²C, IrDA, SPI, UART/USART, USB
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 46
• Program Memory Size: 80KB (80K x 8)
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 80-TQFP, 80-VQFP
• For Use With: 497-5577 - BOARD EVAL USB POWER SWITCH497-5518 - EVAL BOARD RFID READER
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Other names: 497-4903

UPSD3422, UPSD3433, UPSD3434, UPSD3454
25.2.1
Figure 51. Interrupt transfer
●
Enumeration
Enumeration is the process that takes place when a device is first connected to the USB.
During enumeration, the host requests information from the device about what it is, how
many endpoints it has, the power requirements, bus bandwidth requirements, and what
driver to load.
The enumeration process consists of a series of six steps as follows:
1.
2.
3.
4.
5.
6.
Control Transfers (see
Control transfers are used to configure and send commands to a device. Control
transfers consist of two or three stages:
–
–
–
When a device is first connected to the USB, its address is zero. Upon detecting a new
device connected to the USB, the host sends a Get_Descriptor request to address
zero, endpoint0.
The device, upon receiving a Get_Descriptor request, sends data back to the host
identifying what it is.
The host resets the device and then sends a Set_Address request. This is a unique
address that identifies it from all other devices connected to the USB. This address
remains in effect until the device is disconnected from the USB.
The host sends more Get_Descriptor requests to the device to gather more detailed
information about it and then loads the specified driver.
The host will setup and enable the endpoints defined by the device.
The device is now configured and ready for use with the host communicating to the
device using the assigned address and endpoints.
SETUP
This stage always consists of a data packet with eight bytes of USB CONTROL
data.
DATA stage (optional)
If the CONTROL data is such that the host is requesting information from the
device, the SETUP stage is followed by a DATA stage. In this case, the host sends
an IN token and the device responds with the requested data in the data packet.
STATUS stage
This stage is essentially a handshake informing the device of a successfully
completed control operation.
IN
Once the enumeration process is complete, the device is available for use.
ADDR
Token packet
ENDP
Figure
CRC5
52)
Data1
Data packet
Payload
data
CRC16
Handshake packet
ACK
USB interface
AI10491b
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