MSC8113 Reference Manual, Rev. 0
1-24
Freescale Semiconductor
MSC8113 Overview
when the timers reach a predefined value. The timers are clocked by either the internal clock
generator or one of four dedicated external signals or from the receive and transmit TDM clocks.
When a timer reaches a predefined value, it either toggles or generates a pulse that can be
directed to one of the four dedicated external signals or to other timers. In addition, it can
generate an interrupt.
Note:
For details, see Chapter 22, Timers.
1.2.12 GPIOs
The MSC8113 device has 32 general-purpose I/O (GPIO) signals. Each connection in the I/O
ports is configured either as a GPIO signal or as a dedicated peripheral interface signal. In
addition, fifteen of the GPIO signals can generate interrupts to the global interrupt controller
(GIC). Each line is configured as an input or output (with a register for data output that is read or
written at any time). All outputs 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 tri-state (high impedance) when driving a high voltage. GPIO signals do not have
internal pull-up resistors. Dedicated MSC8113 peripheral functions are multiplexed onto the
shared external connections. The functions are grouped to maximize connection use for the
greatest number of MSC8113 applications.
Note:
For details, see Chapter 23, GPIO.
1.2.13 Reset and Boot
The Hard Reset Configuration Word (HRCW) contains the essential information for resetting the
device, including the PLL divide ratio, signal configuration, and the DSI host endian mode. This
configuration word is initialized by writing to it either from the system configuration source.
When the MSC8113 is reset from the system bus, the configuration word is latched using a
dedicated
RSTCONF
signal. In another reset procedure, a master DSP reads data from the ROM and
latches it to the other DSPs. When resetting from an external host, the HRCW is latched from the
32 least significant bits (lsb) of the DSI bus. Immediately after reset, SC140 core 0 starts
executing the code on the internal boot ROM. The value in the configuration register identifies
the boot source. There are five possible boot sources:
System port
External host
TDM interface
UART
I
2
C
software module
Note:
For details, see Chapter 5, Reset and Chapter 6, Boot Program.
Содержание MSC8113
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