Power Port F pull-down control register
| PD0 | Port F pull-down bit y When set, this bit activates the pull-down on PH[y] when APC bit is set in PWR_CR3 register. |
| PD1 | Port F pull-down bit y When set, this bit activates the pull-down on PH[y] when APC bit is set in PWR_CR3 register. |
| PD2 | Port F pull-down bit y When set, this bit activates the pull-down on PH[y] when APC bit is set in PWR_CR3 register. |
| PD3 | Port F pull-down bit y When set, this bit activates the pull-down on PH[y] when APC bit is set in PWR_CR3 register. |