LPC2109 datasheet(13/46 Pages) NXP

13 / 46 page

LPC2109_2119_2129

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Product data sheet

Rev. 7 — 14 June 2011

13 of 46

NXP Semiconductors

LPC2109/2119/2129

Single-chip 16/32-bit microcontrollers

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

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)

Reserved for software interrupts only

ARM Core

EmbeddedICE, DbgCommRx

ARM Core

EmbeddedICE, DbgCommTx

Timer 0

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

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

Timer 1

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

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

UART0

Rx Line Status (RLS)

Transmit Holding Register empty (THRE)

Rx Data Available (RDA)

Character Time-out Indicator (CTI)

UART1

Rx Line Status (RLS)

Transmit Holding Register empty (THRE)

Rx Data Available (RDA)

Character Time-out Indicator (CTI)

Modem Status Interrupt (MSI)

PWM0

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

I2C-bus

SI (state change)

SPI0

SPIF, MODF

SPI1 and SSP[1]

SPIF, MODF and TXRIS, RXRIS, RTRIS, RORRIS

PLL

PLL Lock (PLOCK)

RTC

RTCCIF (Counter Increment), RTCALF (Alarm)

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