SERCON410B datasheet(28/34 Pages) STMICROELECTRONICS

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A telegram header for transmit telegram comprises four control words:

DATA STRUCTURES WITHIN THE RAM (Continued)

Index

Bit

Name

Function

0-7

ADR

Telegram address

DMA

Data storage in the RAM (DMA = 0) or DMA transfer (DMA = 1).

DBUF

Data in RAM: single buffer (DBUF = 0) or double buffer (DBUF = 1).

VAL

For double buffering (DMA = 0, DBUF = 1): data in buffer 0 (VAL = 0)

or buffer 1 (VAL = 1) are valid. Set by processor.

11-12

Data telegram is not to be transmitted (EN = 0), transmitted once

(EN = 1), continuously (EN = 2) or transmitted only if the previously

received telegram contains the expected address (EN = 3) (PHAS12

=1 and FLMDTADR = 1). If EN is 1 the circuit sets EN to 0 after

the transmit telegram has been started.

(Not used)

Marker bit for telegram header of transmit telegram.

Marker bit for telegram header.

0-15

TRT

Time for the start of telegram in

•s after the end of MST.

0-15

TLEN

Length of the telegram in data words (not including address).

0-9

Word address of the next telegram header or the end marker.

10-15

(Not used)

SERCON410B

24/30

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