27.7.2 Timer1 Gate Source Selection
The gate source for Timer1 is selected using the GSS bits. The polarity selection for the gate source is controlled by the GPOL bit.
Any of the above mentioned signals can be used to trigger the gate. The output of the CMPx can be synchronized to the Timer1 clock or left asynchronous. For more information refer to the “Comparator Output Synchronization” section.