MSC8113 Reference Manual, Rev. 0
19-2
Freescale Semiconductor
Internal Peripheral Bus (IPBus)
19.2
UART
The UART, also known as the serial communication interface (SCI), provides a full-duplex port
for serial communications with other devices. This interface uses two dedicated signals: transmit
data (TXD) and receive data (RXD). Both signal lines are available for general-purpose I/O
(GPIO) when they are not configured for operation.
Note:
For details, see Chapter 21, UART.
19.3
Timers
The MSC8113 device contains 32 timers of 16 bits each that serve as frequency dividers,
watchdog timers, clock generators, and event counters. Each timer receives input from one of 15
sources: six external inputs, eight timer outputs, or the local bus clock (BUSES_CLOCK).
Note:
For details, see Chapter 22, Timers.
19.4
GPIOs
The MSC8113 has 32 general-purpose I/O (GPIO) signals. Each signal line in the I/O port is
configured either as a GPIO signal or as a dedicated peripheral interface signal. In addition,
fifteen of the signal lines can generate interrupts to the global interrupt controller. Each signal is
configured as an input or output (with a register for data output that is read or written at any
time). All output signals can also be configured as open-drain (that is, configured in an active low
wired-OR configuration on the board). In this mode, the signal drives a zero voltage but goes to
three-states when driving a high voltage.
Note:
Chapter 23, GPIO.
19.5
Hardware Semaphore Registers
The MSC8113 hardware semaphores (HS) block holds eight coded hardware semaphores. A
coded hardware semaphore provides a simple way to achieve a lock operation via a single write
access, eliminating the need for sophisticated read-modify-write software mechanisms. Using the
hardware semaphores, external hosts such as DSI external masters can protect internal and
external shared resources and ensure coherency in any sequence of operations on these resources.
The coded hardware semaphore is an eight-bit register with a selective write mechanism.
Note:
Chapter 15, Hardware Semaphores.
19.6
Global Interrupt Controller (GIC)
The GIC performs the following functions:
Содержание MSC8113
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