Upwards Counter; Downwards Counter; Fig. 8-8: Run Down Of The Upwards Counter; Fig. 8-9: Run Down Of The Downwards Counter - Addi-Data APCI-3010 Technical Description

Functions of the board

Upwards counter

After reaching the reload value, the counting value is set on 0 and continues
to be counted. At an overflow an interrupt can be generated.

Downwards counter

Fig. 8-9: Run down of the downwards counter

In order to get the same counting value as in the upwards mode, the reload
value must be set on 3. The counter counts down to 0 and will be reset to the
reload value from the next edge cycle on.
48

Fig. 8-8: Run down of the upwards counter

APCI-3xxx (standard)