39
Pin Functions
Chapter 2
Preliminary User’s Manual U17566EE1V2UM00
2.1.2
Terms
In this section, the following terms are used:
• Pin
Denotes the physical pin. Every pin is uniquely denoted by its pin number.
A pin can be used in several modes. Depending on the selected mode, a pin
name is allocated to the pin.
• Port group
Denotes a group of pins. The pins of a port group have a common set of port
mode control registers.
• Port mode / Port
A pin in port mode works as a general purpose input/output pin. It is then
called “port”.
The corresponding name is Pnm. For example, P07 denotes port 7 of port
group 0. It is referenced as “port P07”.
• Alternative mode
In alternative mode, a pin can work in various non-general purpose input/
output functions, for example, as the input/output pin of on-chip peripherals.
The corresponding pin name depends on the selected function. For
example, pin INTP0 denotes the pin for one of the external interrupt inputs.
Note that for example P00 and INTP0 denote the same physical pin. The
different names indicate the function in which the pin is being operated.
• Port type
A control circuit evaluates the settings of the configuration registers. There
are different types of control circuits, called “port types”.
2.1.3
Noise elimination
The input signals at some pins are passing a filter to remove noise and
glitches. The microcontroller supports both analog and digital filters. The
analog filters are always applied to the input signals, whereas the digital filters
can be enabled/disabled by control registers.
See
“Noise Elimination“ on page 93
for a detailed description.
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