Touch pad 19 configuration register
| FUN_IE | Input enable in normal execution. |
| SLP_OE | Output enable in sleep mode. |
| SLP_IE | Input enable in sleep mode. |
| SLP_SEL | 1: enable sleep mode. 0: no sleep mode |
| FUN_SEL | Function selection. |
| MUX_SEL | 1: use RTC GPIO. 0: use digital GPIO. |
| RUE | Pull-down enable of the pad. 1: internal pull-down enabled. 0: internal pull-down disabled. |
| RDE | Pull-up enable of the pad. 1: internal pull-up enabled. 0: internal pull-up disabled. |
| DRV | Select the drive strength of the pad. 0: ~5 mA. 1: ~10 mA. 2: ~20 mA. 3: ~40 mA. |