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17.2 MIOS14 Key Features
The basic features of the MIOS14 are as follows:
• Modular architecture at the silicon implementation level
• Disable capability in each submodule to allow power saving when its function is not
needed
• Six 16-bit counter buses to allow action submodules to use counter data
• When not used for timing functions, every channel signal can be used as a port
signal: I/O, output only or input only, depending on the channel function.
• Submodules' signal status bits reflect the status of the signal
• MIOS14 counter prescaler submodule (MCPSM):
— Centralized counter clock generator
— Programmable 4-bit modulus down-counter
— Wide range of possible division ratios: 2 through 16
— Count inhibit under software control
• MIOS14 modulus counter submodule (MMCSM):
— Programmable 16-bit modulus up-counter with built-in programmable 8-bit
prescaler clocked by MCPSM output.
— Maximum increment frequency of the counter:
– Clocked by the internal MCPSM output: f
– Clocked by the external signal: f
— Flag setting and possible interrupt generation on overflow of the up-counter
— Time counter on internal clock with interrupt capability after a pre-determined
time
— Optional signal usable as an external event counter (pulse accumulator) with
overflow and interrupt capability after a pre-determined number of external
events.
— Usable as a regular free-running up-counter
— Capable of driving a dedicated 16-bit counter bus to provide timing information
to action submodules (the value driven is the contents of the 16-bit up-counter
register)
— Optional signal to externally force a load to the counter with modulus value
• MIOS14 double action submodule (MDASM):
— Versatile 16-bit dual action unit allowing two events to occur before software
intervention is required
— Six software selectable modes allowing the MDASM to perform pulse width and
period measurements, PWM generation, single input capture and output
compare operations as well as port functions
MOTOROLA
Chapter 17. Modular Input/Output Subsystem (MIOS14)
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
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MIOS14 Key Features
17-3
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