ST10F280 datasheet(69/186 Pages) STMICROELECTRONICS

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ST10F280

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11.2.5 - XPOLAR Register (polarity of the XPWM channel)

XPOLAR (EC04h)

Reset Value: 0000h

Software Control of the XPWM Outputs

In an application the XPWM output signals are

generally controlled by the XPWM module. How-

ever, it may be necessary to influence the level of

the XPWM output pins via software either to ini-

tialize the system or to react on some extraordi-

nary

condition,

e.g.

system

fault

emergency.

Clearing the timer run bit PTRx stops the associ-

ated counter and leaves the respective output at

its current level.

The individual XPWM channel outputs are con-

trolled by comparators according to the formula:

– PWM output signal = [PTx]

≥ [PWx shadow

latch].

So whenever software changes registers XPTx,

the respective output will reflect the condition after

the change. Loading timer XPTx with a value

greater than or equal to the value in XPWx imme-

diately sets the respective output, a XPTx value

below the XPWx value clears the respective out-

put.

Note

To prevent further PWM pulses from

occurring

after

such

software

intervention the respective counter must

be stopped first.

3210

---

XPOLAR.3 XPOLAR.2 XPOLAR.1 XPOLAR.0

Bit

Function

XPOLAR.x

XPOLAR Channel x polarity Bit

Polarity of Channel x is normal

Polarity of Channel x is inverted

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