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ARM7 UM10139

Nov 01, 2014




UM10139LPC214x User manualRev. 3 4 October 2010 User manual

Document information Info Keywords Abstract Content LPC2141, LPC2142, LPC2144, LPC2146, LPC2148, LPC2000, LPC214x, ARM, ARM7, embedded, 32-bit, microcontroller, USB 2.0, USB device LPC214x User Manual

NXP Semiconductors


Revision history Rev 3 Date 20101004 Description Modifications:

2 1 20061030 20050815

New document template applied. I2C chapter: multiple errors corrected (Chapter 14 LPC214x I2C-bus interface I2C0/1). IAP call example updated (Section 21.9). WDFEED register description updated Section 16.4.3 Watchdog Feed register (WDFEED - 0xE000 0008). RTC usage note updated (Section 18.5 RTC usage notes). CTCR register bit description corrected (Section 18.4.4 Clock Tick Counter Register (CTCR - 0xE002 4004)). PINSEL2 register description updated (Section 6.4.3 Pin function Select register 2 (PINSEL2 - 0xE002 C014)). PWM TCR register bit 3 description updated (Section 16.4.2 PWM Timer Control Register (PWMTCR - 0xE001 4004)). U0IER register bit description corrected (Section 10.3.6 UART0 Interrupt Enable Register (U0IER - 0xE000 C004, when DLAB = 0)). U1IER register bit description corrected (Section 11.3.6 UART1 Interrupt Enable Register (U1IER - 0xE001 0004, when DLAB = 0)). Pin description updated for VBAT, VREF, and RTCX1/2 (Section 5.2 Pin description for LPC2141/2/4/6/8). SSP CR0 register corrected (Section 13.4.1 SSP Control Register 0 (SSPCR0 0xE006 8000)). ADC maximum voltage updated (Table 278 ADC pin description). Minimum DLL value for use with fractional divider corrected (Section 10.3.4 UART0 Fractional Divider Register (U0FDR - 0xE000 C028) and Section 11.3.4 UART1 Fractional Divider Register (U1FDR - 0xE001 0028)). CRP levels updated (Section 21.7 Code Read Protection (CRP)). Numerous editorial updates throughout the user manual.

LPC2141/2/4/6/8 user manual Initial version

Contact informationFor more information, please visit: For sales office addresses, please send an email to: [email protected] All information provided in this document is subject to legal disclaimers. NXP B.V. 2010. All rights reserved.

User manual

Rev. 3 4 October 2010

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UM10139Chapter 1: Introductory informationRev. 3 4 October 2010 User manual

1.1 IntroductionThe LPC2141/2/4/6/8 microcontrollers are based on a 32/16 bit ARM7TDMI-S CPU with real-time emulation and embedded trace support, that combines the 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 % with minimal performance penalty. Due to their tiny size and low power consumption, LPC2141/2/4/6/8 are ideal for applications where miniaturization is a key requirement, such as access control and point-of-sale. A blend of serial communications interfaces ranging from a USB 2.0 Full Speed device, multiple UARTs, SPI, SSP to I2Cs, 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 particularly suitable for industrial control and medical systems.

1.2 Features 16/32-bit ARM7TDMI-S microcontroller in a tiny LQFP64 package. 8 to 40 kB of on-chip static RAM and 32 to 512 kB of on-chip flash program memory.128 bit wide interface/accelerator enables high speed 60 MHz operation.

In-System/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 bytes in 1 ms.

EmbeddedICE RT and Embedded Trace interfaces offer real-time debugging with theon-chip RealMonitor software and high speed tracing of instruction execution.

USB 2.0 Full Speed compliant Device Controller with 2 kB of endpoint RAM.In addition, the LPC2146/8 provide 8 kB of on-chip RAM accessible to USB by DMA.

One or two (LPC2141/2 vs. LPC2144/6/8) 10-bit A/D converters provide a total of 6/14analog inputs, with conversion times as low as 2.44 s per channel.

Single 10-bit D/A converter provides variable analog output. Two 32-bit timers/external event counters (with four capture and four comparechannels each), PWM unit (six outputs) and watchdog.

Low power real-time clock with independent power and dedicated 32 kHz clock input. Multiple serial interfaces including two UARTs (16C550), two Fast I2C-bus(400 kbit/s), SPI and SSP with buffering and variable data length capabilities.

Vectored interrupt controller with configurable priorities and vector addresses. Up to 45 of 5 V tolerant fast general purpose I/O pins in a tiny LQFP64 package. Up to nine edge or level sensitive external interrupt pins available.UM10139 All information provided in this document is subject to legal disclaimers. NXP B.V. 2010. All rights reserved.

User manual

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NXP Semiconductors

UM10139Chapter 1: Introductory information

60 MHz maximum CPU clock available from programmable on-chip PLL with settlingtime of 100 s.

On-chip integrated oscillator operates with an external crystal in range from 1 MHz to30 MHz and with an external oscillator up to 50 MHz.

Power saving modes include Idle and Power-down. Individual enable/disable of peripheral functions as well as peripheral clock scaling foradditional power optimization.

Processor wake-up from Power-down mode via external interrupt, USB, Brown-OutDetect (BOD) or Real-Time Clock (RTC).

Single power supply chip with Power-On Reset (POR) and BOD circuits: CPU operating voltage range of 3.0 V to 3.6 V (3.3 V 10 %) with 5 V tolerant I/O pads.

1.3 Applications Industrial control Medical systems Access control Point-of-sale Communication gateway Embedded soft modem General purpose applications

1.4 Device informationTable 1. Device LPC2141/2/4/6/8 device information Number of pins 64 64 64 64 64 On-chip SRAM 8 kB 16 kB 16 kB Endpoint USB RAM 2 kB 2 kB 2 kB On-chip FLASH 32 kB 64 kB 128 kB 256 kB 512 kB Number of 10-bit ADC channels 6 6 14 14 14 Number of 10-bit DAC channels 1 1 1 1 Note

LPC2141 LPC2142 LPC2144 LPC2146 LPC2148

UART1 with full modem interface UART1 with full modem interface UART1 with full modem interface

32 kB + 8 kB[1] 2 kB 32 kB + 8 kB[1] 2 kB


While the USB DMA is the primary user of the additional 8 kB RAM, this RAM is also accessible at any time by the CPU as a general purpose RAM for data and code storage.

1.5 Architectural overviewThe LPC2141/2/4/6/8 consists of an ARM7TDMI-S CPU with emulation support, the ARM7 Local Bus for interface to on-chip memory controllers, the AMBA Advanced High-performance Bus (AHB) for interface to the interrupt controller, and the ARMUM10139 All information provided in this document is subject to legal disclaimers. NXP B.V. 2010. All rights reserved.

User manual

Rev. 3 4 October 2010

4 of 354

NXP Semiconductors

UM10139Chapter 1: Introductory information

Peripheral Bus (APB, a compatible superset of ARMs AMBA Advanced Peripheral Bus) for connection to on-chip peripheral functions. The LPC2141/24/6/8 configures the ARM7TDMI-S processor in little-endian byte order. AHB peripherals are allocated a 2 megabyte range of addresses at the very top of the 4 gigabyte ARM memory space. Each AHB peripheral is allocated a 16 kB address space within the AHB address space. LPC2141/2/4/6/8 peripheral functions (other than the interrupt controller) are connected to the APB bus. The AHB to APB bridge interfaces the APB bus to the AHB bus. APB peripherals are also allocated a 2 megabyte range of addresses, beginning at the 3.5 gigabyte address point. Each APB peripheral is allocated a 16 kB address space within the APB address space. The connection of on-chip peripherals to device pins is controlled by a Pin Connect Block (see chapter "Pin Connect Block" on page 58). This must be configured by software to fit specific application requirements for the use of peripheral functions and pins.

1.6 ARM7TDMI-S processorThe ARM7TDMI-S is a general purpose 32-bit microprocessor, which offers high performance and very low power consumption. The ARM architecture is based on Reduced Instruction Set Computer (RISC) principles, and the instruction set and related decode mechanism are much simpler than those of microprogrammed Complex Instruction Set Computers. This simplicity results in a high instruction throughput and impressive real-time interrupt response from a small and cost-effective processor core. Pipeline techniques are employed so that all parts of the processing and memory systems can operate continuously. Typically, while one instruction is being executed, its successor is being decoded, and a third instruction is being fetched from memory. The ARM7TDMI-S processor also employs a unique architectural strategy known as THUMB, which makes it ideally suited to high-volume applications with memory restrictions, or applications where code density is an issue. The key idea behind THUMB is that of a super-reduced instruction set. Essentially, the ARM7TDMI-S processor has two instruction sets:

The standard 32-bit ARM instruction set. A 16-bit THUMB instruction set.The THUMB sets 16-bit instruction length allows