LPC3240 datasheet(23/73 Pages) NXP

Part #	LPC3240

Description	16/32-bit ARM microcontrollers; hardware floating-point coprocessor, USB On-The-Go, and EMC memory interface

PDF	73 Pages

Scroll/Zoom	100%

Manufacturer	NXP [NXP Semiconductors]

Direct Link	http://www.nxp.com

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23 / 73 page

LPC3220_30_40_50_1

Preliminary data sheet

Rev. 01 — 6 February 2009

23 of 73

NXP Semiconductors

LPC3220/30/40/50

16/32-bit ARM microcontrollers

7.2.1 APB

Many peripheral functions are accessed by on-chip APBs that are attached to the higher

speed AHB. The APB performs reads and writes to peripheral registers in three peripheral

clocks.

7.2.2 FAB

Some peripherals are placed on a special bus called FAB that allows faster CPU access

to those peripheral functions. A write access to FAB peripherals takes a single AHB clock

and a read access to FAB peripherals takes two AHB clocks.

7.3 Physical memory map

The physical memory map incorporates several distinct regions, as shown in Figure 3.

When an application is running, the CPU interrupt vectors are re-mapped to allow them to

reside in on-chip SRAM (IRAM).

LPC3240 Datasheet(PDF) 23 Page - NXP Semiconductors