27.4 Signal Description

The I/O lines of the PORT are mapped to pins of the physical device. The following naming scheme is used: Each line bundle with up to 32 lines is assigned an identifier 'xy', with letter x = A, B, C… and two-digit number y = 00, 01, …31. Examples: A24, C03.

The PORT pins are labeled 'Pxy' accordingly, for example PA24, PC03. This identifies each pin in the device uniquely.

Each pin may be controlled by many peripheral multiplexer settings, which allow the pad to be routed internally to a dedicated peripheral function. When the setting is enabled, the selected peripheral has control over the output state of the pad, and the ability to read the current physical pad state. Refer to the Pinout for details.

Device-specific configurations may cause some lines (and the corresponding Pxy pin) not to be implemented.

Analog functions are connected between the analog blocks and the I/O pads using analog buses. Selecting an analog peripheral function for a given pin will disable the corresponding digital features of the pad.