SLRC400 datasheet(22/130 Pages) PHILIPS

22 / 130 page

Philips Semiconductors

Product Specification Rev. 2.0 November 2001

•CODE Reader IC

SL RC400

Preliminary

5.2.1.4

PrimaryStatus Register

Status flags of the receiver, transmitter and the FIFO buffer.

Name: PrimaryStatus

Address: 0x03

Reset value: 00000001, 0x01

ModemState

IRq

Err

HiAlert

LoAlert

Access

Rights

Description of the bits

Bit

Symbol

Function

Reserved for future use.

ModemState shows the state of the transmitter and receiver state machines.

State

Name of State

Description

000

Idle

Neither the transmitter nor the receiver is in operation,

since none of them is started or

since none of them has got input data.

001

TxSOF

Transmitting the ‘Start Of Frame’ Pattern.

010

TxData

Transmitting data from the FIFO buffer (or redundancy

check bits).

011

TxEOF

Transmitting the ‘End Of Frame’ Pattern.

GoToRx1

Mean-State passed, when receiver starts.

100

GoToRx2

Mean-State passed, when receiver finishes.

101

PrepareRx

Waiting until the time period selected in the RxWait

110

AwaitingRx

Receiver activated; Awaiting an input signal at pin Rx.

6-4

ModemState

111

Receiving

Receiving data.

IRq

This bit shows, if any interrupt source requests attention (with respect to the

setting of the interrupt enable flags in the InterruptEn Register).

Err

This bit is set to 1, if any error flag in the ErrorFlag Register is set.

HiAlert

Is set to 1, when the number of bytes stored in the FIFO buffer fulfil the following

equation:

WaterLevel

FIFOLength

HiAlert

≤

−

)

(

Example:

FIFOLength=60, WaterLevel=4

⇒ HiAlert =1

FIFOLength=59, WaterLevel=4

⇒ HiAlert =0

LoAlert

Is set to 1, when the number of bytes stored in the FIFO buffer fulfil the following

equation:

WaterLevel

FIFOLength

LoAlert

≤

Example:

FIFOLength=4, WaterLevel=4

⇒ LoAlert =1

FIFOLength=5, WaterLevel=4

⇒ LoAlert =0

SLRC400 Datasheet(PDF) 22 Page - NXP Semiconductors

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