Philips Semiconductors

LPC2114/LPC2124

Single-chip 16/32-bit microcontrollers

Product data

Rev. 03 — 22 December 2004

12 of 34

9397 750 13145

© Koninklijke Philips Electronics N.V. 2004. All rights reserved.

Vectored IRQs have the middle priority. Sixteen of the interrupt requests can be

assigned to this category. Any of the interrupt requests can be assigned to any of the

16 vectored IRQ slots, among which slot 0 has the highest priority and slot 15 has the

lowest.

Non-vectored IRQs have the lowest priority.

The VIC combines the requests from all the vectored and non-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 there. If any of the vectored IRQs are

requesting, the VIC provides the address of the highest-priority requesting IRQs

service routine, otherwise it provides the address of a default routine that is shared by

all the non-vectored IRQs. The default routine can read another VIC register to see

what IRQs are active.

6.5.1

Interrupt sources

Table 4 lists the interrupt sources for each peripheral function. Each peripheral device

has one interrupt line connected to the Vectored Interrupt Controller, but may have

several internal interrupt flags. Individual interrupt flags may also represent more than

one interrupt source.

Table 4:

Interrupt sources

Block

Flag(s)

VIC channel #

WDT

Watchdog Interrupt (WDINT)

0

-

Reserved for software interrupts only

1

ARM Core

Embedded ICE, DbgCommRx

2

ARM Core

Embedded ICE, DbgCommTx

3

Timer 0

Match 0 - 3 (MR0, MR1, MR2, MR3)

Capture 0 - 3 (CR0, CR1, CR2, CR3)

4

Timer 1

Match 0 - 3 (MR0, MR1, MR2, MR3)

Capture 0 - 3 (CR0, CR1, CR2, CR3)

5

UART0

Rx Line Status (RLS)

Transmit Holding Register empty (THRE)

Rx Data Available (RDA)

Character Time-out Indicator (CTI)

6

UART1

Rx Line Status (RLS)

Transmit Holding Register empty (THRE)

Rx Data Available (RDA)

Character Time-out Indicator (CTI)

Modem Status Interrupt (MSI)

7

PWM0

Match 0 - 6 (MR0, MR1, MR2, MR3, MR4, MR5, MR6)

8

SI (state change)

9

SPI0

SPIF, MODF

10

SPI1

SPIF, MODF

11

PLL

PLL Lock (PLOCK)

12

RTC

RTCCIF (Counter Increment), RTCALF (Alarm)

13