SLRC400 datasheet(69/130 Pages) PHILIPS

69 / 130 page

Philips Semiconductors

Product Specification Rev. 2.0 November 2001

•CODE Reader IC

SL RC400

Preliminary

INTERRUPT REQUEST SYSTEM

8.1

Overview

The SL RC400 indicates certain events by setting bit IRq in the PrimaryStatus-Register and, in addition, by

activating pin IRQ. The signal on pin IRQ may be used to interrupt the µ-Processor using its interrupt

handling capabilities. This allows the implementation of efficient µ-Processor software.

8.1.1

INTERRUPT SOURCES OVERVIEW

The following table shows the integrated interrupt flags, the related source and the condition for its setting.

The interrupt flag TimerIRq indicates an interrupt set by the timer unit. The setting is done when the timer

decrements from 1 either down to zero (TAutoRestart flag disabled) or to the TPreLoad value if TAutoRestart

is enabled.

The TxIRq bit indicates interrupts from different sources. If the transmitter is active and the state changes

from sending data to transmitting the end of frame pattern, the transmitter unit sets automatically the interrupt

bit. The CRC coprocessor sets TxIRq after having processed all data from the FIFO buffer. This is indicated

by the flag CRCReady = 1. If the E

2Prom programming has finished the TxIRq bit is set, indicated by the bit

E2Ready = 1.

The RxIRq flag indicates an interrupt when the end of the received data is detected.

The flag IdleIRq is set if a command finishes and the content of the command register changes to idle.

The flag HiAlertIRq is set to 1 if the HiAlert bit is set to one, that means the FIFO buffer has reached the level

indicated by the bit WaterLevel, see chapter 7.4.

The flag LoAlertIRq is set to 1 if the LoAlert bit is set to one, that means the FIFO buffer has reached the

level indicated by the bit WaterLevel, see chapter 7.4.

Interrupt Flag

Interrupt Source

Is set automatically, when

TimerIRq

Timer Unit

the timer counts from 1 to 0

Transmitter

a data stream, transmitted to the label, ends

TxIRq

CRC-Coprocessor

all data from the FIFO buffer has been processed

RxIRq

Receiver

a data stream, received from the label, ends

IdleIRq

Command Register

a command execution finishes

HiAlertIRq

FIFO-buffer

the FIFO-buffer is getting full

LoAlertIRq

FIFO-buffer

the FIFO-buffer is getting empty

Table 8-1: Interrupt Sources

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