LPC2378 datasheet(21/68 Pages) NXP

21 / 68 page

LPC2377_78

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Product data sheet

Rev. 5 — 17 June 2010

21 of 68

NXP Semiconductors

LPC2377/78

Single-chip 16-bit/32-bit microcontrollers

• 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. Usually the burst size is set to half the size of the FIFO in the

peripheral.

• Internal four-word FIFO per channel.

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

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

error has occurred.

• Interrupt masking. The DMA error and DMA terminal count interrupt requests can be

masked.

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

prior to masking.

7.9 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.

The LPC2377/78 use accelerated GPIO functions:

• GPIO registers are relocated to the ARM local 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.

Additionally, any pin on Port 0 and Port 2 (total of 46 pins) providing a digital function can

be programmed to generate an interrupt on a rising edge, a falling edge, or both. The

edge detection is asynchronous, so it may operate when clocks are not present such as

during Power-down mode. Each enabled interrupt can be used to wake up the chip from

Power-down mode.

7.9.1 Features

• Bit level set and clear registers allow a single instruction to set or clear any number of

bits in one port.

• Direction control of individual bits.

• All I/O default to inputs after reset.

• Backward compatibility with other earlier devices is maintained with legacy Port 0 and

Port 1 registers appearing at the original addresses on the APB bus.

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