LPC2470 datasheet(29/72 Pages) PHILIPS

29 / 72 page

LPC2470_0

Preliminary data sheet

Rev. 00.01 — 5 October 2007

29 of 72

NXP Semiconductors

LPC2470

Fast communication chip

service routine can simply start dealing with that device. But if more than one request is

assigned to the FIQ class, the FIQ service routine can read a word from the VIC that

identifies which FIQ source(s) is (are) requesting an interrupt.

Vectored IRQs, which include all interrupt requests that are not classified as FIQs, have a

programmable interrupt priority. When more than one interrupt is assigned the same

priority and occur simultaneously, the one connected to the lowest numbered VIC channel

will be serviced first.

The VIC ORs the requests from all of the vectored IRQs to produce the IRQ signal to the

ARM processor. The IRQ service routine can start by reading a register from the VIC and

jumping to the address supplied by that register.

7.4.1 Interrupt sources

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

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

source.

Any pin on PORT0 and PORT2 (total of 64 pins) regardless of the selected function, can

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

interrupt request coming from PORT0 and/or PORT2 will be combined with the EINT3

interrupt requests.

7.5 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.

7.6 External memory controller

The LPC2470 EMC is an ARM PrimeCell MultiPort Memory Controller peripheral offering

support for asynchronous static memory devices such as RAM, ROM, and flash. In

addition, it can be used as an interface with off-chip memory-mapped devices and

peripherals. The EMC is an Advanced Microcontroller Bus Architecture (AMBA) compliant

peripheral.

7.6.1 Features

• Dynamic memory interface support including single data rate SDRAM.

• Asynchronous static memory device support including RAM, ROM, and flash, with or

without asynchronous page mode.

• Low transaction latency.

• Read and write buffers to reduce latency and to improve performance.

• 8/16/32 data and 24 address lines wide static memory support.

• 16 bit and 32 bit wide chip select SDRAM memory support.

• Static memory features include:

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