NXP Semiconductors

DRAFT

D

D

 

AFT

RAFT

RAFT AFT

 

 

 

DR

DR

DLPC2917/19

ARM9 microcontrollerRAFT withDRAFTCANDRAFTand LINDRAFT

8.3 General subsystem

T DRAFT

T

DRA

DRA DR

F

F

DRAFT DRAFT DRAF

8.3.1General subsystem clock description

The general subsystem is clocked by CLK_SYS_GESS, see Section 7.2.2.

8.3.2Chip and feature identification

DRAFT DRAFT

DRAFT

D

 

8.3.2.1Overview

The key features are:

Identification of product

Identification of features enabled

8.3.2.2Description

The Chip/Feature ID (CFID) module contains registers which show and control the functionality of the chip. It contains an ID to identify the silicon, and also registers containing information about the features enabled or disabled on the chip.

8.3.2.3CFID pin description

The CFID has no external pins.

8.3.3System Control Unit (SCU)

8.3.3.1Overview

The system control unit takes care of system-related functions.The key feature is configuration of the I/O port-pins multiplexer.

8.3.3.2Description

The system control unit defines the function of each I/O pin of the LPC2917/19. The I/O pin configuration should be consistent with peripheral function usage.

8.3.3.3SCU pin description

The SCU has no external pins.

8.3.4Event router

8.3.4.1Overview

The event router provides bus-controlled routing of input events to the vectored interrupt controller for use as interrupt or wake-up signals.

Key features:

DRA

Up to 24 level-sensitive external interrupt pins, including CAN, LIN and RxD wake-up features plus three internal event sources

Input events can be used as interrupt source either directly or latched (edge-detected)

Direct events disappear when the event becomes inactive

Latched events remain active until they are explicitly cleared

Programmable input level and edge polarity

Event detection maskable

LPC2917_19_1

© NXP B.V. 2007. All rights reserved.

Preliminary data sheet

Rev. 1.01 — 15 November 2007

22 of 68

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NXP Semiconductors LPC2919, LPC2917 General subsystem clock description, Chip and feature identification, Event router