Touch sensor configuration register
| TOUCH_OUTEN | Enable touch controller output. |
| TOUCH_STATUS_CLR | Clear all touch active status. |
| TOUCH_DATA_SEL | 0 and 1: touch_raw_data; 2: base_line; 3: touch_smooth_data. |
| TOUCH_DENOISE_END | Touch denoise done. |
| TOUCH_UNIT_END | Indicate the completion of sampling. |
| TOUCH_APPROACH_PAD2 | Indicate which pad is selected as proximity pad2 |
| TOUCH_APPROACH_PAD1 | Indicate which pad is selected as proximity pad1 |
| TOUCH_APPROACH_PAD0 | Indicate which pad is selected as proximity pad0 |