Spectrum Brands MC.31XX - Manual (Page 64)

64 MC.31xx Manual
External TTL trigger Trigger modes and appendant registers
Positive and negative TTL trigger
This mode is for detecting the rising and falling edges of an ex-
ternal TTL signal. The board will trigger on the first rising or falling
edge that is detected after starting the board. The next triggere-
vent will then be detected, if the actual recording/replay has fin-
ished and the board is armed and waiting for a trigger again.
Pulsewidth triggers
TTL pulsewidth trigger for long HIGH pulses
This mode is for detecting HIGH pulses of an external TTL signal
that are longer than a programmed pulsewidth. If the pulse is
shorter than the programmed pulsewidth, no trigger will be de-
tected. The board will trigger on the first pulse matching the trig-
ger condition after starting the board. The next triggerevent will
then be detected, if the actual recording/replay has finished and
the board is armed and waiting for a trigger again.
TTL pulsewidth trigger for short HIGH pulses
This mode is for detecting HIGH pulses of an external TTL signal
that are shorter than a programmed pulsewidth. If the pulse is
longer than the programmed pulsewidth, no trigger will be detect-
ed. The board will trigger on the first pulse matching the trigger
condition after starting the board. The next triggerevent will then
be detected, if the actual recording/replay has finished and the
board is armed and waiting for a trigger again.
Register Value Direction Description
SPC_TRIGGERMODE 40000 r/w Sets the triggermode for the board.
TM_TTLBOTH 20030 Sets the trigger mode for external TTL trigger to detect positive and negative edges.
Register Value Direction Description
SPC_PULSEWIDTH 44000 r/w Sets the pulsewidth in samples. Values from 2 to 255 are allowed.
SPC_TRIGGERMODE 40000 r/w Sets the triggermode for the board.
TM_TTLHIGH_LP 20001 Sets the trigger mode for external TTL trigger to detect HIGH pulses that are longer than a programmed pulsewidth.
Register Value Direction Description
SPC_PULSEWIDTH 44000 r/w Sets the pulsewidth in samples. Values from 2 to 255 are allowed.
SPC_TRIGGERMODE 40000 r/w Sets the triggermode for the board.
TM_TTLHIGH_SP 20002 Sets the trigger mode for external TTL trigger to detect HIGH pulses that are shorter than a programmed pulsewidth.