Microchip Technology DM164130-10 User Manual
Main PSMC Configuration GUI
2012-2013 Microchip Technology Inc.
DS40001671B-page 35
2.20.4
Output Polarity
The output polarity control determines the active-true level of the channel output. The
active time starts at the rising event and ends at the falling event. Polarity is selected
by clicking on the output of the channel buffer. The output will appear as a bubble for
active-low polarity and as a line for active-high polarity.
active time starts at the rising event and ends at the falling event. Polarity is selected
by clicking on the output of the channel buffer. The output will appear as a bubble for
active-low polarity and as a line for active-high polarity.
2.20.5
Shutdown Level
Shutdown level is the level forced on the output when a shutdown condition is active.
The shutdown level for a channel is selected by clicking on the switch at the input of
the shutdown MUX. Note that the polarity control is ahead of the shutdown MUX so that
the shutdown output level is not affected by the polarity control.
The shutdown level for a channel is selected by clicking on the switch at the input of
the shutdown MUX. Note that the polarity control is ahead of the shutdown MUX so that
the shutdown output level is not affected by the polarity control.
2.21 AUTO-SHUTDOWN
Auto-shutdown provides the ability to suspend the PWM output immediately upon an
external input or program control. The auto-shutdown control, shown in Figure X
Auto-Shutdown, is opened by clicking on the auto-shutdown block in the main GUI.
external input or program control. The auto-shutdown control, shown in Figure X
Auto-Shutdown, is opened by clicking on the auto-shutdown block in the main GUI.
2.21.1
Shutdown Enable
Shutdown is enabled by clicking on the switch at the output of the control. When
shutdown is enabled then a high on any shutdown source will force the PSMC outputs
to a predetermined state until the shutdown source goes low and the PSMC is
restarted.
shutdown is enabled then a high on any shutdown source will force the PSMC outputs
to a predetermined state until the shutdown source goes low and the PSMC is
restarted.
2.21.2
Shutdown Sources
Shutdown sources are selected by clicking on the broken lines leading to the 8-input
OR gate. The broken line will change to an unbroken line indicating that the connection
is made. Remove source selections by clicking on the unbroken OR gate input line.
The ASE switch is a software control bit that provides software generated shutdown
events. You can preset this bit by clicking on the switch.
OR gate. The broken line will change to an unbroken line indicating that the connection
is made. Remove source selections by clicking on the unbroken OR gate input line.
The ASE switch is a software control bit that provides software generated shutdown
events. You can preset this bit by clicking on the switch.
2.21.3
Shutdown Override
Clicking on the ASDOV switch changes the state of the auto-shutdown override bit.
When set, this bit forces a shutdown condition that remains in effect as long as the bit
is set. Manual and automatic restarts have no affect while the ASDOV bit is set.
When set, this bit forces a shutdown condition that remains in effect as long as the bit
is set. Manual and automatic restarts have no affect while the ASDOV bit is set.
2.21.4
Auto/Manual Restart
Clicking on the ARSEN switch selects between automatic and manual restart. When
restart is automatic then the PSMC will resume operation after all shutdown sources
are low. When restart is manual, then the ASE bit must be cleared by software to restart
the PSMC. The ASE bit can only be cleared if all input sources are low. In either case,
PSMC operation resumes on the first period event after the shutdown is cleared.
restart is automatic then the PSMC will resume operation after all shutdown sources
are low. When restart is manual, then the ASE bit must be cleared by software to restart
the PSMC. The ASE bit can only be cleared if all input sources are low. In either case,
PSMC operation resumes on the first period event after the shutdown is cleared.