STMicroelectronics STM32F05 series Reference Manual page 692

Touch sensing controller (TSC)
Bit 1 START: Start a new acquisition
Bit 0 TSCE: Touch sensing controller enable
Note: When the touch sensing controller is disabled, TSC registers settings have no effect.
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This bit is set by software to start a new acquisition. It is cleared by hardware as soon as the
acquisition is complete or by software to cancel the on-going acquisition.
0: Acquisition not started
1: Start a new acquisition
This bit is set and cleared by software to enable/disable the touch sensing controller.
0: Touch sensing controller disabled
1: Touch sensing controller enabled
Doc ID 018940 Rev 1
RM0091