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Hi,

For my application I need to count pulses from a position encoder. As I have plenty of IRQ inputs on the MOD54415 it should be trivial to make an interrupt routine that deals with the counting etc...

However, while looking through the documentation of the MCF54418 I noticed there are four "DMA Timers" which can also be used as general purpose timers or, by supplying an external clock signal, as counters. The external clock is supposed to be supplied on DtnIN pins, of which there should be four. If I could use those I can probably get away with a lot less interrupts to service.

I can't find any reference to those DTnIN pins on the MOD54415'd data sheet though so my immediate question is: are they present anywhere on the 50 pin J1 and J2 connectors ?

If not: would they happen to be on the third double row pin header (into which no pin headers are mounted) ?

Third question, just out of curiosity: what is that third 26 pin "connector", Is there a description somewhere ?

Any info much appreciated.

Hi,

I have located them: they are T0IN, T1IN, T2IN, T3IN on J2 pins 36, 34, 33 and 32 respectively.

The initial problem in finding them was that the processor documentation sometimes refers to them as DTnIN and other times as TnIN. Two different names for the same thing so automated searches are a bit difficult.

Still curious about that 26 pin connector though.

The third, unpopulated, connector on the MOD54415 is for factory bringup and lowlevel debugging in house. This is the same with every one of the MOD series boards.