LPC1766 datasheet(36/70 Pages) ETC2

36 / 70 page

LPC1766_0.02

Objective data sheet

Rev. 00.02 — 12 August 2008

36 of 70

NXP Semiconductors

LPC1766

Fast communication chip

7.30.4 APB interface

The APB peripherals are split into two separate APB buses in order to distribute the bus

bandwidth and thereby reducing stalls caused by contention between the CPU and the

GPDMA controller.

7.30.5 AHB multilayer matrix

The LPC1766 uses an AHB multilayer matrix. This matrix connects the instruction (I-code)

and data (D-code) CPU buses of the ARM Cortex-M3 to the flash memory, the main

(32KB) static RAM, and the Boot ROM. The GPDMA can also access all of these

memories as can the peripheral DMA controllers (Ethernet and USB). Additionally, the

matrix connects the CPU system bus and all of the DMA controllers to the various

peripheral functions.

7.30.6 External interrupt inputs

The LPC1766 includes up to 46 edge sensitive interrupt inputs combined with up to four

level sensitive external interrupt inputs as selectable pin functions. The external interrupt

inputs can optionally be used to wake up the processor from Power-down mode.

7.30.7 Memory mapping control

The Cortex-M3 incorporates a mechanism that allows remapping the interrupt vector table

to alternate locations in the memory map. This is controlled via the Vector Table Offset

The vector table may be located anywhere within the bottom 1 GB of Cortex-M3 address

space. The vector table must be located on a 128 word (512 byte) boundary because the

NVIC on the LPC1766 is configured for 128 total interrupts.

7.31 Emulation and debugging

Debug and trace functions are integrated into the ARM Cortex-M3. Serial wire debug and

trace functions are supported in addition to a standard JTAG debug and parallel trace

functions. The ARM Cortex-M3 is configured to support up to eight breakpoints and four

watch points.

CAUTION

If level three Code Read Protection (CRP3) is selected, no future factory testing can be

performed on the device.

LPC1766 Datasheet(PDF) 36 Page - List of Unclassifed Manufacturers