ST7263BK4 STMicroelectronics, ST7263BK4 Datasheet - Page 97

• Manufacturer Part Number: ST7263BK4
• Description: LOW SPEED USB 8-BIT MCU FAMILY WITH UP TO 32K FLASH/ROM, DFU CAPABILITY, 8-BIT ADC, WDG, TIMER, SCI and I2C
• Manufacturer: STMicroelectronics

Specifications of ST7263BK4

• 4, 8, 16 Or 32 Kbytes Program Memory: high density Flash (HDFlash), FastROM or ROM with Read-Out and Write protection

ST7263Bxx
11.4
11.4.1
11.4.2
11.4.3
USB interface (USB)
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. The use of DMA
architecture allows the endpoint definition to be completely flexible. Endpoints can be
configured by software as in or out.
Main features
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Functional description
The block diagram in
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.
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 3.3 V Regulator
On-Chip USB Transceiver
Figure
44, gives an overview of the USB interface hardware.
Doc ID 7516 Rev 8
On-chip peripherals
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