HP E1429A Input Configuration Registers, A/D Status Register, A/D Serial Register, Base +0316

The Input Configuration Registers

The input configuration registers are used to set the following digitizer input parameters:

∙Input enable

∙Input impedance

∙Input filter

∙Measurement range

The A/D Status Register base +0316

The A/D status register is a read only register that returns the status of the digitizer’s input section. The register bits are defined below. Only the use of bit 0 is documented.

Address		7		6		5		4	3	2		1	0
base + 0316	Ch. 2 Diff.		Ch. 1 Diff.		Ch2. S/E		Ch1. S/E		unused	Ovld		Error	Bit State
		ovld		ovld		ovld		ovld		clr		LED
	0	- no ovld	0	- no ovld	0	- no ovld	0	- no ovld	---		0	- OFF	out data
	1	- ovld	1	- ovld	1	- ovld	1	- ovld			1	- ON

The state (’1’ or ’0’) of bit 0 represents the state of the A/D shift register’s output bit (bit 55). A read of the status register (and the output bit) does not cause a shift of the A/D shift register.

The A/D Serial Register base +0516

The A/D serial register is a read/write register that receives and sends configuration data from/to the A/D shift register. The shift register is used to enable the inputs, and to set the input impedance, filter, and measurement range.

Address

base + 0516

7	6	5		4	3	2	1	0
			unused					register write: shifts one bit into the shift
								register
								register read: reads one bit out of the shift
								register

Each time a ’1’ or ’0’ is written to the serial reg ister, one bit is loaded into the A/D shift register at bit position 0.

Each time the serial register is read, one bit is shifted out of the A/D shift register.

350 Register Programming Appendix C