LPC1765 datasheet(18/66 Pages) NXP

18 / 66 page

LPC1769_68_67_66_65_64_4

Product data sheet

Rev. 04 — 1 February 2010

18 of 66

NXP Semiconductors

LPC1769/68/67/66/65/64

32-bit ARM Cortex-M3 microcontroller

7.7 Nested Vectored Interrupt Controller (NVIC)

The NVIC is an integral part of the Cortex-M3. The tight coupling to the CPU allows for low

interrupt latency and efficient processing of late arriving interrupts.

7.7.1 Features

• Controls system exceptions and peripheral interrupts

• In the LPC17xx, the NVIC supports 33 vectored interrupts

• 32 programmable interrupt priority levels, with hardware priority level masking

• Relocatable vector table

• Non-Maskable Interrupt (NMI)

• Software interrupt generation

7.7.2 Interrupt sources

Each peripheral device has one interrupt line connected to the NVIC but may have several

interrupt flags. Individual interrupt flags may also represent more than one interrupt

source.

Any pin on Port 0 and Port 2 (total of 42 pins) regardless of the selected function, can be

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

7.8 Pin connect block

The pin connect block allows selected pins of the microcontroller to have more than one

function. Configuration registers control the multiplexers to allow connection between the

pin and the on-chip peripherals.

Peripherals should be connected to the appropriate pins prior to being activated and prior

to any related interrupt(s) being enabled. Activity of any enabled peripheral function that is

not mapped to a related pin should be considered undefined.

Most pins can also be configured as open-drain outputs or to have a pull-up, pull-down, or

no resistor enabled.

7.9 General purpose DMA controller

The GPDMA is an AMBA AHB compliant peripheral allowing selected peripherals to have

DMA support.

The GPDMA enables peripheral-to-memory, memory-to-peripheral,

peripheral-to-peripheral, and memory-to-memory transactions. The source and

destination areas can each be either a memory region or a peripheral, and can be

accessed through the AHB master. The GPDMA controller allows data transfers between

the USB (LPC1769/68/66/65/64 only) and Ethernet controllers (LPC1769/68/67/66/64

only) and the various on-chip SRAM areas. The supported APB peripherals are SSP0/1,

all UARTs, the I2S-bus interface, the ADC, and the DAC. Two match signals for each timer

can be used to trigger DMA transfers. Note that the I2S-bus interface and the DAC are not

available on the LPC1764.

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