Hi,
I was wondering if it is possible to daisychain the multiple tdc’s? I am running in a situation where the max 8 millisecond range of mode 2 isn’t enough. I was looking to see if it would be possible to trigger the interrupt out1 if the counter overflows. Then I could use that to trigger the start of a second tdc. But it looks like the counter overflow only triggers the overflow interrupt register?
So I was wondering if anybody else had another bright idea :-)
regards,
Per
Per,
The Interrupt output is controlled by the status of the various Interrupt register bits. It is possible to have the overflow counter masked to prevent it from setting the INTB output state.
The interrupt output is active low output while the trigger is an active high output. I suppose you could place an inverter in series with the interrupt signal to initiate the trigger on another TDC.
Another option, however, might be to lower your input clock frequency. Clock Count and normLSB (which ultimately dictates the maximum listen time) are both functions of the clock frequency. So, if the input clock frequency were lower than the typical 8 MHz, we could give up some resolution to achieve a longer listen time. The input clock frequency should be able to vary anywhere from 1 MHz to 16 MHz.
Thanks,
Scott Bryson
