MSC8113 Reference Manual, Rev. 0
Freescale Semiconductor
23-1
GPIO
23
The MSC8113 device has 32 general-purpose I/O (GPIO) ports that are multiplexed as either
GPIO ports or dedicated peripheral interface ports. In addition, fifteen of the GPIOs can be
configured to serve as Ethernet interface ports, and fifteen of the GPIOs can be configured to
generate interrupts to the Global Interrupt Controller (GIC). As GPIOs, each port is configured as
an input or output (with a register for data output that is read or written at any time). If configured
as output, the GPIO ports can also be configured as open-drain (that is, configured in an active
low wired-OR configuration on the board). In this mode, an output drives a zero voltage but goes
to tri-state when driving a high voltage. GPIO ports do not have internal pull-up resistors. The
dedicated MSC8113 peripheral functions multiplexed with the GPIO ports are grouped to
maximize the usefulness of the ports in the greatest number of MSC8113 applications.
Note:
To understand the port assignment capability described in this chapter, you must first
understand the Ethernet, Time-Division Multiplexing (TDM), timers, and UART
peripherals.
23.1 Features
Following are the key features of the GPIO ports:
32 GPIO ports.
All ports are bidirectional.
All ports have alternate on-device peripheral functions.
All ports are set as GPIO inputs at system reset.
All port values can be read while the port is connected to an internal peripheral.
All ports have open-drain output capability.
Fifteen of the GPIOs can be used as interrupt inputs.
Fifteen of the GPIOs can be used as Ethernet interface ports
Содержание MSC8113
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