Enabling the Counter/Timer
In order to save space, the counter/timers use the same addresses as PPI 0 (Base A 0h to
Base A 3h). To “map in the counter/timer (and “map out” PPI 0), write any value to Base
A Dh. To “map out” the counter/timer (and “map in” PPI 0), read from Base A Dh. This
mapping does not reset either chip in any way, so you can (for example) map in the counter/timer, set it
to generate a particular frequency, then map it out and use PPI 0 while the counter/timer continues to
generate the frequency.
Manual 104-DIO-48E, 24E
26
