Initial lpc214x support

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@193 42af7a65-404d-4744-a932-0658087f49c3

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+General Description
+^^^^^^^^^^^^^^^^^^^
+
+http://www.nxp.com/pip/LPC2141FBD64.html:
+
+The LPC2141/42/44/46/48 microcontrollers are based on a 16-bit/32-bit ARM7TDMI-S
+CPU with real-time emulation and embedded trace support, that combine
+microcontroller with embedded high-speed flash memory ranging from 32 kB to
+512 kB. A 128-bit wide memory interface and a unique accelerator architecture
+enable 32-bit code execution at the maximum clock rate. For critical code size
+applications, the alternative 16-bit Thumb mode reduces code by more than 30 pct
+with minimal performance penalty. 
+
+Due to their tiny size and low power consumption, LPC2141/42/44/46/48 are ideal
+for applications where miniaturization is a key requirement, such as access
+control and point-of-sale. Serial communications interfaces ranging from a USB 2.0
+Full-speed device, multiple UARTs, SPI, SSP to I2C-bus and on-chip SRAM of 8 kB
+up to 40 kB, make these devices very well suited for communication gateways and
+protocol converters, soft modems, voice recognition and low end imaging, providing
+both large buffer size and high processing power. Various 32-bit timers, single
+or dual 10-bit ADC(s), 10-bit DAC, PWM channels and 45 fast GPIO lines with up
+to nine edge or level sensitive external interrupt pins make these microcontrollers
+suitable for industrial control and medical systems. 
+
+
+Features
+^^^^^^^^
+
+o 16-bit/32-bit ARM7TDMI-S microcontroller in a tiny LQFP64 package. 
+o 8 kB to 40 kB of on-chip static RAM and 32 kB to 512 kB of on-chip flash memory.
+  128-bit wide interface/accelerator enables high-speed 60 MHz operation. 
+o In-System Programming/In-Application Programming (ISP/IAP) via on-chip boot
+  loader software. Single flash sector or full chip erase in 400 ms and programming
+  of 256 B in 1 ms. 
+o EmbeddedICE RT and Embedded Trace interfaces offer real-time debugging with the
+  on-chip RealMonitor software and high-speed tracing of instruction execution. 
+o USB 2.0 Full-speed compliant device controller with 2 kB of endpoint RAM. In addition,
+  the LPC2146/48 provides 8 kB of on-chip RAM accessible to USB by DMA. 
+o One or two (LPC2141/42 vs. LPC2144/46/48) 10-bit ADCs provide a total of 6/14 analog
+  inputs, with conversion times as low as 2.44 us per channel. 
+o Single 10-bit DAC provides variable analog output (LPC2142/44/46/48 only). 
+o Two 32-bit timers/external event counters (with four capture and four compare
+  channels each), PWM unit (six outputs) and watchdog. 
+o Low power Real-Time Clock (RTC) with independent power and 32 kHz clock input. 
+o Multiple serial interfaces including two UARTs (16C550), two Fast I2C-bus (400
+  kbit/s), SPI and SSP with buffering and variable data length capabilities. 
+o Vectored Interrupt Controller (VIC) with configurable priorities and vector addresses. 
+o Up to 45 of 5 V tolerant fast general purpose I/O pins in a tiny LQFP64 package. 
+o Up to 21 external interrupt pins available. 
+o 60 MHz maximum CPU clock available from programmable on-chip PLL with settling
+  time of 100 us. 
+o On-chip integrated oscillator operates with an external crystal from 1 MHz to 25 MHz. 
+o Power saving modes include Idle and Power-down. 
+o Individual enable/disable of peripheral functions as well as peripheral clock scaling
+  for additional power optimization. 
+o Processor wake-up from Power-down mode via external interrupt or BOD. 
+o Single power supply chip with POR and BOD circuits: 
+o CPU operating voltage range of 3.0 V to 3.6 V (3.3 V +- 10 pct) with 5 V tolerant
+  I/O pads. 
+
+