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MAN0878-09-EN_XLE_XLT_UserManual

A u g u s t 2 3 , 2 0 1 8 P a g e 94 | 158

At controller power-up or during a download, the PWM output is maintained at zero until

both the Period (count) and the Duty cycle (count) are loaded with non-zero values.

When the controller is placed in stop mode, the state of the PWM outputs is dependent

on the PWM State on Controller Stop configuration. This configuration allows for either

hold-last-state or specific prescale, period and duty cycle counts. Specifying zero for

either the period or duty causes the PWM output to remain low during stop mode.

NOTE: The nominal output driver turn-on-time delay (to reach 50% output) is 25μs on

Models 3-5. Therefore, this limitation should be considered when determining both the

minimum pulse width and the duty cycle accuracy of the application.

The following table shows the PWM registers used for the Legacy and Extended

PWM revisions:

Table 12.3 – PWM Legacy and New Extended Registers

PWM: Legacy Registers

PWM: New Extended Registers

AQ1 – PWM1 Duty Cycle(DWord)

AQ1 – PWM1 Duty Cycle

AQ2 – Reserved

AQ3 – PWM2 Duty Cycle(DWord)

AQ3 – PWM2 Duty Cycle

AQ4 – Reserved

AQ5 – Pre-Scale(DWord)

AQ5 – PWM1 Pre-Scale

AQ6 – PWM2 Pre-Scale

AQ7 – Period(DWord)

AQ7 – PWM1 Period

AQ8 – PWM2 Period

1) When an old XLE/XLT file is auto configured to a new XLE/XLEe or XLT/XLTe file, then

the old formula and registers are taken and firmware will do the required adjustments

for the PWM to function normally.

2) When a new XLE/XLT file is created, then the new formula will be applied and the

configuration must be as per the new register set.

HORNER XLE-Model 2 User Manual

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