AP1_ENABLE=B_0x0
DBGMCU status register
| AP0_PRESENT | Access point 0 presence 1 (B_0x1): AP present |
| AP1_PRESENT | Access point 1 presence 1 (B_0x1): AP present |
| AP0_ENABLE | Access point 0 enable 1 (B_0x1): Always enable |
| AP1_ENABLE | Access point 1 enable 0 (B_0x0): AP disabled (debug access locked) 1 (B_0x1): AP enabled (debug access open) |