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ST72734 Datasheet(PDF) 79 Page - STMicroelectronics |
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ST72734 Datasheet(HTML) 79 Page - STMicroelectronics |
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79 / 144 page  ST72774/ST727754/ST72734 79/144 4.6 USB INTERFACE (USB) 4.6.1 Introduction The USB Interface implements a low-speed function interface between the USB and the ST7 microcontroller. 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. 4.6.2 Main Features s USB Specification Version 1.0 Compliant s Supports Low-Speed USB Protocol s Two or Three Endpoints (including default one) depending on the device (see device feature list and register map) s CRC generation/checking, NRZI encoding/ decoding and bit-stuffing s USB Suspend/Resume operations s DMA Data transfers s On-Chip 3.3V Regulator s On-Chip USB Transceiver 4.6.3 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 transmission/reception, and handshaking as required by the USB standard. It also performs frame formatting, including CRC generation and checking. Endpoints The Endpoint registers indicate if the microcontroller 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, application software can know which USB event has occurred. 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 REGISTERS data busses USBGND |
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