SERCON410B datasheet(21/34 Pages) STMICROELECTRONICS

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4 CONTROL REGISTERS AND RAM DATA

STRUCTURES

4.1 CONTROL REGISTER ADDRESSES

The following table is an overview of the control

registers. The address is the word address which

is input by A6-1. To calculate the byte address, the

value has to be multiplied by two. The reset val-

ues of the control registers are shown in bold.

A6-1

Bit

Name

R/W

Value

Function

0-15

VERSION

Circuit code (0002H)

RSTFL

R/W

Reset has not taken place

Reset has taken place

SWRST

Do not reset

Reset by software

(Not used)

REPON

R/W

Repeater turned off

Repeater turned on

SREGEN

Level at SREGEN pin

REGMODE

R/W

Sampling at the middle of bit

Sampling according to SERCOS interface

specification

R/W

Baud rate = fSCLK /16

Baud rate = fSCLK /32

POLRXD

R/W

“Light on” when RxD = 0

“Light on” when RxD = 1

PRESYNC

R/W

No pre-frame sync word

Pre-frame sync word

POLTXD

R/W

“Light on” when TxD = 0

“Light on” when TxD = 1

ENTSBAUD

R/W

Baud rate selected by SWSBAUD pin

Baud rate selected by SWSBAUD control bit

SBAUD

Level at pin SBAUD

RXDNRZ

R/W

Receive data is NRZI-coded

WRSYNC

R/W

Direct RAM write access

RAM write access internally synchronized

DMAMODE

R/W

DMAREQR/DMAREQT are static signals

DMAREQR/DMAREQT are pulses

(Not used)

All control registers can be written to and read

(R/W), with the exception of the control bits that

initiate an action (W). The status registers can

only be read (R). When control registers which

contain bits that are not used or can only be read,

are written to, these bits can be set to 0 or 1; they

are not evaluated internally. If control registers

are read with bits that are not used, these bits are

set to 0.

SERCON410B

17/30

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