LPC2141 PHILIPS [NXP Semiconductors], LPC2141 Datasheet - Page 16

• Manufacturer Part Number: LPC2141
• Description: Single-chip 16-bit/32-bit microcontrollers; up to 512 kB flash with ISP/IAP, USB 2.0 full-speed device, 10-bit ADC and DAC
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
9397 750 14985
Preliminary data sheet
6.10.1 Features
6.10 USB 2.0 device controller
6.11 UARTs
The USB is a 4-wire serial bus that supports communication between a host and a
number (127 max) of peripherals. The host controller allocates the USB bandwidth to
attached devices through a token based protocol. The bus supports hot plugging,
unplugging, and dynamic configuration of the devices. All transactions are initiated by the
host controller.
The LPC2141/42/44/46/48 is equipped with a USB device controller that enables
12 Mbit/s data exchange with a USB host controller. It consists of a register interface,
serial interface engine, endpoint buffer memory and DMA controller. The serial interface
engine decodes the USB data stream and writes data to the appropriate end point buffer
memory. The status of a completed USB transfer or error condition is indicated via status
registers. An interrupt is also generated if enabled.
A DMA controller (available in LPC2146/48 only) can transfer data between an endpoint
buffer and the USB RAM.
The LPC2141/42/44/46/48 each contain two UARTs. In addition to standard transmit and
receive data lines, the LPC2144/46/48 UART1 also provides a full modem control
handshake interface.
Compared to previous LPC2000 microcontrollers, UARTs in LPC2141/42/44/46/48
introduce a fractional baud rate generator for both UARTs, enabling these microcontrollers
to achieve standard baud rates such as 115200 with any crystal frequency above 2 MHz.
In addition, auto-CTS/RTS flow-control functions are fully implemented in hardware
(UART1 in LPC2144/46/48 only).
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Selectable speed versus power.
Fully compliant with USB 2.0 Full-speed specification.
Supports 32 physical (16 logical) endpoints.
Supports control, bulk, interrupt and isochronous endpoints.
Scalable realization of endpoints at run time.
Endpoint maximum packet size selection (up to USB maximum specification) by
software at run time.
RAM message buffer size based on endpoint realization and maximum packet size.
Supports SoftConnect and GoodLink LED indicator. These two functions are sharing
one pin.
Supports bus-powered capability with low suspend current.
Supports DMA transfer on all non-control endpoints (LPC2146/48 only).
One duplex DMA channel serves all endpoints (LPC2146/48 only).
Allows dynamic switching between CPU controlled and DMA modes (only in
LPC2146/48).
Double buffer implementation for bulk and isochronous endpoints.
Rev. 01 — 3 October 2005
LPC2141/42/44/46/48
Single-chip 16-bit/32-bit microcontrollers
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
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