Nxp Semiconductors OM11043 数据表
LPC1769_68_67_66_65_64_63
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Product data sheet
Rev. 9.5 — 24 June 2014
24 of 89
NXP Semiconductors
LPC1769/68/67/66/65/64/63
32-bit ARM Cortex-M3 microcontroller
8.7 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.
interrupt latency and efficient processing of late arriving interrupts.
8.7.1 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
8.7.2 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.
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.
programmed to generate an interrupt on a rising edge, a falling edge, or both.
8.8 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.
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.
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.
no resistor enabled.
8.9 General purpose DMA controller
The GPDMA is an AMBA AHB compliant peripheral allowing selected peripherals to have
DMA support.
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 and Ethernet controllers and the various on-chip SRAM areas. The supported
APB peripherals are SSP0/1, all UARTs, the I
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 and Ethernet controllers and the various on-chip SRAM areas. The supported
APB peripherals are SSP0/1, all UARTs, the I
2
S-bus interface, the ADC, and the DAC.
Two match signals for each timer can be used to trigger DMA transfers.
Remark: The Ethernet controller is available on parts LPC1769/68/67/66/64. The USB
controller is available on parts LPC1769/68/66/65/64. The I
controller is available on parts LPC1769/68/66/65/64. The I
2
S-bus interface is available on
parts LPC1769/68/67/66/65. The DAC is available on parts LPC1769/68/67/66/65/63.