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Chapter 7
Signal multiplexing and signal descriptions
7.1 Introduction
To optimize functionality in small packages, pins have several functions available via
signal multiplexing. Information found here illustrates which of this device's signals are
multiplexed on which external pin.
The
Port Control
block controls which signal is present on the external pin. Refer to that
chapter to find which register controls the operation of a specific pin.
7.2 Port control and interrupt module features
• 32-pin ports
Not all pins are available on the device. See the following
section for details.
The reset state and read/write characteristics of the fields within the PORTx_PCRn
registers is summarized in the table below.
7.3 Signal multiplexing constraints
1. A given peripheral function must be assigned to a maximum of one package pin. Do
not program the same function to more than one pin.
2. To ensure the best signal timing for a given peripheral's interface, choose the pins in
closest proximity to each other.
NXP Semiconductors
NOTE
MC9S08SU16 Reference Manual, Rev. 5, 4/2017
75
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