HP E1418A Software Trigger Register, Trigger Control Register, Trig Syst En:, Trigger Mode:, Software Trigger:

Software Trigger Register

The Software Trigger Register provides a means to trigger the module when software trigger has been selected as the trigger source in the Trigger Control Register.

Address	Bit	15	14	13	12	11	10	09	08	07	06	05	04	03	02	01	00
Base + 0C16
	WRITE							Software Trigger

Software Trigger: When software trigger is selected as the trigger source in the Trigger Control Register, any write to this register generates the trigger (the value written is not important).

Trigger Control Register

The Trigger Control Register selects the sources, destinations, and modes used to synchronize channels programmed for triggered operation.

Address	Bit	15	14	13	12	11	10	09	08	07	06	05	04	03	02	01	00
	READ	Trig			Unused				Trigger Out			Trigger		Trigger Source
Base + 0E16
		Syst En										Mode
	WRITE

Trig Syst En: Writing a one (1) to this field enables the trigger system.

Writing a zero (0) disables the trigger system.

Trigger Out: This field selects which VXIbus trigger line will be driven when the trigger mode is set to Output. The trigger lines selected are shown below.

Line Out Selected		Bits
	08	07	06
TTLTRIG0*	0	0	0
TTLTRIG1*	0	0	1
TTLTRIG2*	0	1	0
TTLTRIG3*	0	1	1
TTLTRIG4*	1	0	0
TTLTRIG5*	1	0	1
TTLTRIG6*	1	1	0
TTLTRIG7*	1	1	1

Trigger Mode: This field selects the operating mode for trigger-enabled channels.

Trigger Mode	Bits
	05	04
SYNC	0	0
OUTPUT	1	1

Appendix B HP E1418A Register-Based Programming 131