L6280 datasheet(12/26 Pages) STMICROELECTRONICS

12 / 26 page

Data and Address Decoding

SPECIAL WORDS

0011

101

KEYWORD

This word is used during the start-up procedure to

enable operations; all settings arrived before the

keyword are reset.

0011

010

WATCHDOG

The microprocessor must periodically generate

this word; the value of the maximum period is set

by the capacitor CD. The absence of the Watch-

dog is interpreted by L6280 as a microprocessor

failure. The maximum period is:

TWD =CD x 1.5 / ( 50 x 10E-6)

Except for special words (keyword and watch-

dog), the input words are organized like the fol-

lowing:

A0 A1

Operation selection

A2 A3

Channel selection

D0 D1 D2 D3 Datas

A0,A1 DECODING (OPERATION SELECTION)

A0,A1select the type of operation (channel initiali-

zation, commands, DACs loading, DAC in-

crement/decrement).

A0 A1

0 0 This configuration is used to send the infor-

mation about the configuration of the

vchannel specified by A3 and A2; D0 to D3

are used to specify the configuration of the

channel (full bridge, dual half bridge, unipo-

lar motor).

A0 A1

0 This configuration is used to change driv-

ing strategy of the output stages of the

channel specified by A3 and A2 (full/half

step, slow/fast decay and so on). The driv-

ing strategy is coded in D0 to D3, and de-

pends from the configuration of the output

stage.

A0 A1

0 1 This configuration is used to load the value

of a DAC of the channel selected by A3

and A2. D3 indicates right and left DAC

just for channel 1 and 2.

Figure 12: Program Sequence

L6280

12/26

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