ST9 datasheet(83/146 Pages) STMICROELECTRONICS

Nome de Peças	ST9

Descrição Electrónicos	USER GUIDE

PDF	146 Pages

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Fabricante Electrônico	STMICROELECTRONICS [STMicroelectronics]

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ST9 USER GUIDE

that are symmetrically centred on half of the reload value. For example, if the reload value is

255, the compare registers are set to the following values:

You need to ensure that the compare registers are not written while they are used for a com-

parison. Because of this, they are written in an interrupt service routine that is triggered by the

MFT itself. To allow maximum latency time, the interrupt is triggered either by a compare 0 or

a compare 1 event, according to the value of the duty cycle. For duty cycles between 0 and

50%, the compare 0 event is used. Between 50% and 100%, the compare 1 event is used.

The following figures shows the timing diagram.

Figure 44

. Output A Timing

Duty Cycle

Compare Register 0

Compare Register 1

10%

115

140

25%

159

50%

191

75%

223

90%

242

Output A

Reload

Value

Compare

Value

Compare

Value

Reload

Interrupt

ST9 Folha de dados(PDF) 83 Page - STMicroelectronics