Sensoray 826 - Manual (Page 49)

NR Preload permissive. Typically used for “one-shot” pulse generator applications.
0 Allow preloading any time. This can be used for applications such as a retriggerable one-shot.
1 Allow preloading only when counts equal zero. This can be used for applications such as a non-retriggerable
one-shot. This applies to both hardware- and software-induced (via S826_CounterPreload function) preloads.
UD Count direction
0 Normal count direction.
1 Reverse count direction.
BP Preload toggle enable.
0 Use only Preload0. The Preload1 register will not be used.
1 Use both preload registers. This is typically used for PWM output.
OM ExtOut mode. Determines when the channel's ExtOut output signal is active. The ExtOut signal may
be routed to a DIO pin by calling S826_DioOutputSourceWrite.
0 Output always inactive.
1 Output pulses active upon Compare register snapshot.
2 Output active when Preload1 register is selected. This is typically used for PWM output.
3 Output active when the counts are not zero; useful for pulse generator applications.
4 Output active when the counts are zero; useful for watchdog timer applications.
OP ExtOut signal polarity.
0 Normal polarity
1 Inverted
TE Count enable trigger. Determines event(s) that will cause counting to be enabled.
0 Enable counting at start-up (i.e., when S826_CounterModeWrite is called to switch to running mode).
1 Enable counting upon Index leading edge.
2 Enable counting upon preload.
3 reserved -- do not use.
TD Count disable trigger. Determines event(s) that will cause counting to be disabled.
0 Never disable counting.
1 Disable counting upon Index falling edge.
2 Disable counting upon zero counts reached.
3 reserved -- do not use
K Clock mode.
0 External single-phase clock, increment on ClkA rising edge.
1 External single-phase clock, increment on ClkA falling edge.
2 Internal 1 MHz clock, increment every microsecond.
3 Internal 50 MHz clock, increment every 40 nanoseconds.
4 Link to adjacent channel's overflow/underflow outputs to this channel's overflow/underflow inputs (see
“Cascading”). The adjacent channel's overflow/underflow output signals will cause this channel to
increment/decrement. For channel 0, channel 5 is the adjacent channel; for all other channels N, the adjacent
channel is N-1.
5 External quadrature clock, x1 multiplier.
6 External quadrature clock, x2 multiplier.
7 External quadrature clock, x4 multiplier.
826 Instruction Manual 44 Counters