STLC5412P datasheet(46/74 Pages) STMICROELECTRONICS

46 / 74 page

MOB = 1: All interrupts issued from

RXM4,

RXM56

RXEOC

and

CR5

are

masked. It is still possible to read

these registers via RXOH.

CTC Corrupted Transmit CRC Control

CTC = 0: Allows the normal calculation of the

CRC for the transmitted data to the line.

CTC = 1: The CRC result transmitted to the line

in the next Superframe is inverted.

This ensure transmission of corrupted

CRC as long as CTC equal 1.

Configuration Register 5 (CR5)

Significant in GCI only.

After reset: FFH

IO4

IO3

IO2

IO1

IO4, IO3, IO2, IO1 Input/Output select for I/O pins

(14, 15, 16, 18)

IOi = 1: IOi pin is selected as an input. An on-

chip pull up resistor ensures a stable

logical 1 at power-on reset or if IOi pin

is not connected to stable source.

IOi = 0: IOi pin is selected as an output.

Each

I/O

can

selected

independently from the others.

D4, D3, D2, D1 I/O pin logical level com-

mand/status.

D4, D3, D2, D1 bits are associated with IO4, IO3,

IO2, IO1 pins respectively. When IOi pin is selected

as an output, the associated Di bit can be written to

control the logical level of the output; Di equals 1

commands a high level on IOi. When IOi pin is se-

lected as an input, the associated Di bit indicates

the status of the input; Di equals one indicates a

high level on IOi. CR5 register is buffered in the in-

terrupt stack each time a status change is detected

on an input. It is also possible to read-back at any

time CR5.

Configuration Register 6 (CR6)

After reset: 0FH

T15E

ACTA

PUPAUT

AIS

TFB0

RFS LFS

T15E Timer 15 seconds extension

T15E = 0: The on chip T4 or T6 timer is done for

the ANSI standard: 15 seconds.

T15E = 1: The on chip T4 or T5 timer is

extended to 20 seconds.

Note: the T15D bit in CR3 register enables or dis-

ables the T4/T5 timer independently of theT15E

bit.

ACTAUT: Activation Automatic

ACTAUT = 1: If UID is powered up, a 10KHz

tone from the

line starts the

activation without need of extra

commands (like AR), except when

QM (Quiet mode) is enterred.

ACTAUT = 0 A detection of a 10KHz tone from

the

line

does

not

start

the

activation: UID waits a primitive

command (normaly AR).

PUPAUT PUP Automatic

PUPAUT = 1: A 10KHz tone from the line allows

an automatic power up of the UID.

Notes if ACTAUT is also set to 1, from a power

down state a 10KHz tone automatically starts the

activation.

PUPAUT = 0: A detection of a 10KHz tone from

the line does not power up the

device: UID waits a PUP primitive

command.

QM Quiet mode.

QM = 1: has the same effect of the QM primitive

command enterred in TXACT register.

An or logic is done with the QM bit and

the QM primitive. The goal of this bit is

to allow a quiet mode for an UID in

power down state in some applications.

QM = 0: no effect.

AIS Analog Interface Select.

AIS = 1: selects an analog interface using 27mh

transformer.

AIS = 0: selects an analog interface using 15mh

transformer

TFB0 Transmit febe equal 0

TFB0 = 0: A permanent febe bit = 0 is sent on

the line as long as TFB0 = 0

TFB0 = 1: The febe bit sent on the line is

normaly computed.

RFS Remote febe select.

Please report to the figure 10. RFS is useful in

repetor application to transfert or not the anoma-

lies from the second line section to the first line

section and viceversa.

STLC5412

46/74

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