UPSD3433EB40U6 STMicroelectronics, UPSD3433EB40U6 Datasheet - Page 145

• Manufacturer Part Number: UPSD3433EB40U6
• Description: MCU 8BIT 8032 128KB FLASH 80TQFP
• Manufacturer: STMicroelectronics
• Series: µPSDr

Specifications of UPSD3433EB40U6

• 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: 160KB (160K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K 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: 497-5518 - EVAL BOARD RFID READER497-5046 - KIT TOOL FOR ST7/UPSD/STR7 MCU
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Other names: 497-5660

uPSD34xx
25.1.2
25.1.3
Endpoints
Each USB device contains a collection of independent endpoints, with an endpoint being the
destination of a communication flow between client software and the device. By design,
each USB device’s endpoints are given specific unique identifiers called endpoint numbers.
In addition, each endpoint has an associated direction for the data flow, either in (from
device to host) or out (from host to device). At the time a device is connected to the USB, it
is assigned a unique address. The combination of the device address, endpoint number,
and direction allows each endpoint to be uniquely referenced.
Each endpoint has some associated characteristics for the communication flow with the
client software running on the host. Those characteristics include:
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All USB devices are required to implement a default control method that uses both the input
and output endpoints with Endpoint zero. The USB System Software uses this default
control method to initialize and generically manipulate the logical device as the Default
Control Pipe. Endpoint zero is always accessible and provides access to the device’s
configuration and status information as well as some basic control access.
Additional (non-zero) endpoints provide the communication flow required for the
functionality of the device. The non-zero endpoints are available for use only after the device
is configured per the normal device configuration process (see Chapter 9 of the USB
specification, http://www.usb.org).
Packets
USB transactions consist of data packets that contain special codes called Packet IDs
(PIDs). A PID signifies the kind of packet that is being transmitted. While there are more
types of PIDs in a USB system, the uPSD34xx responds to the three types shown in
Table 67
Table 67.
Figure 50
Token Packet with an OUT PID. The OUT PID indicates that the host is going to send data to
the addressed device’s endpoint. The ADDR field contains the address of the device and the
ENDP field contains the endpoint within the addressed device. The CRC5 is a Cyclic
Redundancy Check for error checking.
Token
Data
Handshake
Endpoint number;
Frequency and latency requirements;
Bandwidth requirements;
Maximum packet size capability;
Error handling requirements;
Data transfer direction; and
Transfer type.
shows an example of packets sent during a USB transfer. The first packet is a
PID Type
Types of packet IDs
IN, OUT, SETUP
DATA0, DATA1
ACK, NAK, STALL
PID Name
USB interface
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