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參數(shù)資料
| 型號： | ST72622K2B1 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP44 |
| 封裝： | TQFP-44 |
| 文件頁數(shù)： | 118/136頁 |
| 文件大小： | 2475K |
| 代理商： | ST72622K2B1 |
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ST7262
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10.6 USB INTERFACE (USB)
10.6.1 Introduction
The USB Interface implements a low-speed func-
tion interface between the USB and the ST7 mi-
crocontroller. It is a highly integrated circuit which
includes the transceiver, 3.3 voltage regulator, SIE
and DMA. No external components are needed
apart from the external pull-up on USBDM for low
speed recognition by the USB host. The use of
DMA architecture allows the endpoint definition to
be completely flexible. Endpoints can be config-
ured by software as in or out.
10.6.2 Main Features
■ USB Specification Version 1.1 Compliant
■ Supports Low-Speed USB Protocol
■ Two or Three Endpoints (including default one)
depending on the device (see device feature list
and register map)
■ CRC
generation/checking,
NRZI
encoding/
decoding and bit-stuffing
■ USB Suspend/Resume operations
■ DMA Data transfers
■ On-Chip 3.3V Regulator
■ On-Chip USB Transceiver
10.6.3 Functional Description
The block diagram in Figure 50, gives an overview
of the USB interface hardware.
For general information on the USB, refer to the
“Universal Serial Bus Specifications” document
available at http//:www.usb.org.
Serial Interface Engine
The SIE (Serial Interface Engine) interfaces with
the USB, via the transceiver.
The SIE processes tokens, handles data transmis-
sion/reception, and handshaking as required by
the USB standard. It also performs frame format-
ting, including CRC generation and checking.
Endpoints
The Endpoint registers indicate if the microcontrol-
ler is ready to transmit/receive, and how many
bytes need to be transmitted.
DMA
When a token for a valid Endpoint is recognized by
the USB interface, the related data transfer takes
place, using DMA. At the end of the transaction, an
interrupt is generated.
Interrupts
By reading the Interrupt Status register, applica-
tion software can know which USB event has oc-
curred.
Figure 50. USB Block Diagram
CPU
MEMORY
Transceiver
3.3V
Voltage
Regulator
SIE
ENDPOINT
DMA
INTERRUPT
Address,
and interrupts
USBDM
USBDP
USBVCC
6 MHz
REGISTERS
data buses
USBGND
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