UPSD3433EB40U6 STMicroelectronics, UPSD3433EB40U6 Datasheet - Page 144

• 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

USB interface
25.1
25.1.1
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Figure 49. USB module block diagram
Basic USB concepts
The Universal Serial Bus (USB) is more complex than the standard serial port and requires
familiarity with the specification to fully understand how to use the USB peripheral in the
uPSD34xx. The USB specification is available on the Internet at http://www.usb.org. Some
basic concepts will be presented in this section but knowledge of the USB specification is
required.
In a USB system, there is only one master and the master is the host computer. The host
controls all activity on the bus and devices respond to requests from the host. The only
exception is when a device has been put into a low power suspend mode by the host. In this
case, the device can signal a remote wakeup. Outside of that exception, all activity is
controlled and initiated by the host. The host-centric model versus a peer-to-peer model
provides the best way to develop low cost peripherals by keeping the complex control logic
on the host side. The uPSD34xx is a peripheral (non-host) device.
Communication flow
The USB provides a means for communication between host (client) software and a function
on a USB device. Functions can have different requirements for the communication flow
depending on the client software to the USB function interaction. With USB, the various
communication flows are separated to provide better bus utilization. For example, one
communication flow is used for managing the device while another is for transferring data
related to the operation of the device. Some bus access is used for each communication
flow with each flow terminated at an endpoint on a device. Each endpoint has various
aspects associated with the communication flow. A USB device looks like a collection of
endpoints to the USB system.
D–
D+
USB–
USB+
Transceiver
USB
Interface
CTRL and Data
Engine
Clock
Serial
PLL
3 - 40MHz
48MHz
Endpoint0
Endpoint0
Endpoint4
Endpoint4
SETUP Command
OUT FIFOs (64 bytes each)
IN FIFOs (64 bytes each)
Buffer (8 bytes)
FIFO Interface Logic
CTRL
CTRL and Data
XDATA
CTRL
USB SFRs
8032
MCU
uPSD34xx
AI10488
S
R
B
F
u
s