GPIO port pull-up/pull-down register
| PUPD0 | [1:0]: Port x configuration bits (y = 0…15) These bits are written by software to configure the I/O pull-up or pull-down  |  
| PUPD1 | [1:0]: Port x configuration bits (y = 0…15) These bits are written by software to configure the I/O pull-up or pull-down  |  
| PUPD2 | [1:0]: Port x configuration bits (y = 0…15) These bits are written by software to configure the I/O pull-up or pull-down  |  
| PUPD3 | [1:0]: Port x configuration bits (y = 0…15) These bits are written by software to configure the I/O pull-up or pull-down  |  
| PUPD4 | [1:0]: Port x configuration bits (y = 0…15) These bits are written by software to configure the I/O pull-up or pull-down  |  
| PUPD5 | [1:0]: Port x configuration bits (y = 0…15) These bits are written by software to configure the I/O pull-up or pull-down  |  
| PUPD6 | [1:0]: Port x configuration bits (y = 0…15) These bits are written by software to configure the I/O pull-up or pull-down  |  
| PUPD7 | [1:0]: Port x configuration bits (y = 0…15) These bits are written by software to configure the I/O pull-up or pull-down  |  
| PUPD8 | [1:0]: Port x configuration bits (y = 0…15) These bits are written by software to configure the I/O pull-up or pull-down  |  
| PUPD9 | [1:0]: Port x configuration bits (y = 0…15) These bits are written by software to configure the I/O pull-up or pull-down  |  
| PUPD10 | [1:0]: Port x configuration bits (y = 0…15) These bits are written by software to configure the I/O pull-up or pull-down  |  
| PUPD11 | [1:0]: Port x configuration bits (y = 0…15) These bits are written by software to configure the I/O pull-up or pull-down  |  
| PUPD12 | [1:0]: Port x configuration bits (y = 0…15) These bits are written by software to configure the I/O pull-up or pull-down  |  
| PUPD13 | [1:0]: Port x configuration bits (y = 0…15) These bits are written by software to configure the I/O pull-up or pull-down  |  
| PUPD14 | [1:0]: Port x configuration bits (y = 0…15) These bits are written by software to configure the I/O pull-up or pull-down  |  
| PUPD15 | [1:0]: Port x configuration bits (y = 0…15) These bits are written by software to configure the I/O pull-up or pull-down  |