Reserved Modes - Motorola DSP56367 User Manual

Timer/ Event Counter
Timer Modes of Operation
13.4.5

RESERVED MODES

Modes 8, 11, 12, 13, 14, and 15 are reserved.
13.4.6 SPECIAL CASES
The following special cases apply during wait and stop state.
13.4.6.1 Timer Behavior during Wait
Timer clocks are active during the execution of the WAIT instruction and timer activity is
undisturbed. If a timer interrupt is generated, the DSP56367 leaves the wait state and services
the interrupt.
13.4.6.2 Timer Behavior during Stop
During the execution of the STOP instruction, the timer clocks are disabled, timer activity is
stopped, and the TIO0 signal is disconnected. Any external changes that happen to the TIO0
signal is ignored when the DSP56367 is the stop state. To ensure correct operation, the timers
should be disabled before the DSP56367 is placed into the stop state.
13.4.7 DMA TRIGGER
Each timer can also be used to trigger DMA transfers. For this to occur, a DMA channel must
be programmed to be triggered by a timer event. The timer issues a DMA trigger on every
event in all modes of operation. The DMA channel does not have the capability to save
multiple DMA triggers generated by the timer. To ensure that all DMA triggers are serviced,
the user must provide for the preceding DMA trigger to be serviced before the next trigger is
received by the DMA channel.
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