LM3S5D91 Datasheet, PDF (53/1340 Pages) Texas Instruments – Stellaris® LM3S5D91 Microcontroller

Stellaris^® LM3S5D91 Microcontroller
1.3.4.2
1.3.4.3
■ Gluelessly attaches to an external CAN transceiver through the CANnTX and CANnRX signals
USB (see page 917)
Universal Serial Bus (USB) is a serial bus standard designed to allow peripherals to be connected
and disconnected using a standardized interface without rebooting the system.
The LM3S5D91 microcontroller supports three configurations in USB 2.0 full and low speed: USB
Device, USB Host, and USB On-The-Go (negotiated on-the-go as host or device when connected
to other USB-enabled systems).
The USB module has the following features:
■ Complies with USB-IF certification standards
■ USB 2.0 full-speed (12 Mbps) and low-speed (1.5 Mbps) operation with integrated PHY
■ 4 transfer types: Control, Interrupt, Bulk, and Isochronous
■ 32 endpoints
– 1 dedicated control IN endpoint and 1 dedicated control OUT endpoint
– 15 configurable IN endpoints and 15 configurable OUT endpoints
■ 4 KB dedicated endpoint memory: one endpoint may be defined for double-buffered 1023-byte
isochronous packet size
■ VBUS droop and valid ID detection and interrupt
■ Efficient transfers using Micro Direct Memory Access Controller (µDMA)
– Separate channels for transmit and receive for up to three IN endpoints and three OUT
endpoints
– Channel requests asserted when FIFO contains required amount of data
UART (see page 685)
A Universal Asynchronous Receiver/Transmitter (UART) is an integrated circuit used for RS-232C
serial communications, containing a transmitter (parallel-to-serial converter) and a receiver
(serial-to-parallel converter), each clocked separately.
The LM3S5D91 microcontroller includes three fully programmable 16C550-type UARTs. Although
the functionality is similar to a 16C550 UART, this UART design is not register compatible. The
UART can generate individually masked interrupts from the Rx, Tx, modem flow control, modem
status, and error conditions. The module generates a single combined interrupt when any of the
interrupts are asserted and are unmasked.
The three UARTs have the following features:
■ Programmable baud-rate generator allowing speeds up to 5 Mbps for regular speed (divide by
16) and 10 Mbps for high speed (divide by 8)
■ Separate 16x8 transmit (TX) and receive (RX) FIFOs to reduce CPU interrupt service loading
■ Programmable FIFO length, including 1-byte deep operation providing conventional
double-buffered interface
January 22, 2012
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