LPC1765 datasheet(22/79 Pages) NXP

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LPC1769_68_67_66_65_64_63

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Product data sheet

Rev. 7 — 5 April 2011

22 of 79

NXP Semiconductors

LPC1769/68/67/66/65/64/63

32-bit ARM Cortex-M3 microcontroller

7.9.1 Features

• Eight DMA channels. Each channel can support an unidirectional transfer.

• 16 DMA request lines.

• Single DMA and burst DMA request signals. Each peripheral connected to the DMA

Controller can assert either a burst DMA request or a single DMA request. The DMA

burst size is set by programming the DMA Controller.

• Memory-to-memory, memory-to-peripheral, peripheral-to-memory, and

peripheral-to-peripheral transfers are supported.

• Scatter or gather DMA is supported through the use of linked lists. This means that

the source and destination areas do not have to occupy contiguous areas of memory.

• Hardware DMA channel priority.

• AHB slave DMA programming interface. The DMA Controller is programmed by

writing to the DMA control registers over the AHB slave interface.

• One AHB bus master for transferring data. The interface transfers data when a DMA

request goes active.

• 32-bit AHB master bus width.

• Incrementing or non-incrementing addressing for source and destination.

• Programmable DMA burst size. The DMA burst size can be programmed to more

efficiently transfer data.

• Internal four-word FIFO per channel.

• Supports 8, 16, and 32-bit wide transactions.

• Big-endian and little-endian support. The DMA Controller defaults to little-endian

mode on reset.

• An interrupt to the processor can be generated on a DMA completion or when a DMA

error has occurred.

• Raw interrupt status. The DMA error and DMA count raw interrupt status can be read

prior to masking.

7.10 Fast general purpose parallel I/O

Device pins that are not connected to a specific peripheral function are controlled by the

GPIO registers. Pins may be dynamically configured as inputs or outputs. Separate

registers allow setting or clearing any number of outputs simultaneously. The value of the

output register may be read back as well as the current state of the port pins.

LPC17xx use accelerated GPIO functions:

• GPIO registers are accessed through the AHB multilayer bus so that the fastest

possible I/O timing can be achieved.

• Mask registers allow treating sets of port bits as a group, leaving other bits

unchanged.

• All GPIO registers are byte and half-word addressable.

• Entire port value can be written in one instruction.

• Support for Cortex-M3 bit banding.

• Support for use with the GPDMA controller.

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