The Arm Internal Bus Registerbase + 4716

The function of the arm internal bus register is defined below.

Address

base + 4716

7

6

5

4

3

2

1

0

 

 

 

 

 

 

 

 

register write: arm trigger

Writing any 8-bit value to the register generates an arm trigger when the arm source is an HP-IB Group Execute Trigger or the IEEE-488.2 *TRG command.

The Arm Source Register

 

 

 

 

 

 

 

base + 4916

 

 

The Arm source register is used to set the source and slope of the signal

 

 

 

which arms the digitizer. The register bits are described below.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Address

 

7

6

 

5

 

4

3

2

 

1

 

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

base + 4916

 

128

64

 

32

 

16

8

4

 

2

 

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Purpose

 

Source 2

 

Arm source 2

 

Source 1

 

Arm source 1

 

 

 

 

slope

 

 

 

 

 

slope

 

 

 

 

 

 

Setting

 

0 - positive

 

0 0 0 - 1 1 1

 

0 - positive

 

0 0 0 - 1 1 1

 

 

 

 

1 - negative

 

 

 

 

 

1 - negative

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Arm Source Register Power-on/Reset Settings

At power-on or following a reset, the arm source register is set to 0111 1111 or 7F16.

Bit Descriptions Source 2 slope: Bit 7 sets the slope of arm source 2. For all arm sources except a TTLTrg trigger line (bits 6 - 4 =001) and the HP-IB GET command or *TRG command (bits 6 - 4 =010), the slope should be set to positive (0).

Arm source 2: Bits 6 - 4 set arm trigger source 2. Arm source 2 and arm source 1 are ORed together so that an arm from either source arms the digitizer. Setting bits 6 - 4 as follows sets the arm source indicated.

0 0 0 - "Ext 1" BNC connector.

0 0 1* - TTLTrg trigger line (negative-edge triggered)

0 1 0* - HP-IB GET command or IEEE-488.2 *TRG command(negative

edge

triggered)

0 1 1

- arm when a specified input level on channel 1 is reached

1 0 0

- arm when a specified input level on channel 2 is reached

1 0 1

- ECLTrg0 trigger line

1 1 0

- ECLTrg1 trigger line

1 1 1

- OFF (arm source 2 is disabled)

Appendix C

Register Programming 355

Page 355
Image 355
HP E1429A manual Arm Internal Bus Registerbase +, Arm Source Register Power-on/Reset Settings