HP 53A, E1351A Register Descriptions, READ Registers, Register Offset, WRITE Registers

Register Offset The register offset is the register’s location in the block of 64 address bytes. For example, with a LADDR of 112 the multiplexer’s Scan Channel Delay Register has an offset of 0816. When you write a command to this register, the offset is added to the base address to form the register address:

DC0016 + 0816 = DC0816	(A16 outside the command module)
1FDC0016 + 0816 = 1FDC0816	(A16 inside the command module)
or
56,320 + 8 = 56,328	(A16 outside the command module)
2,087,936 + 8 = 2,087,944	(A16 inside the command module)

Register Descriptions

There are six WRITE and two READ-only registers on the multiplexer. You can READ-back three of the WRITE registers. This section contains a description and a bit map of each register. Note that the bit names with an * after them are True (asserted) when low (zero). An X represents a "do not care" situation and a 1 always represents 1.

WRITE Registers The following WRITE registers are located on the multiplexer:

∙Status/Control Register (base + 0416)

∙Scan Control Register (base + 0616)

∙Scan Channel Delay Register (base + 0816)

∙Scan Channel Configuration Register (base + 0A16)

∙Direct Channel Configuration Register (base + 0C16)

∙Direct Control Register (base + 0E16)

READ Registers There are two READ-only registers and three READ-back registers.

∙Manufacturer ID Register (base + 0016) READ-only

∙Device Type Register (base + 0216) READ-only

∙Status/Control Register (base + 0416)

∙Scan Control Register (base + 0616)

∙Scan Channel Delay Register (base + 0816)

Manufacturer ID Register

base + 0016	15	14	13	12	11	10	9	8	7		6	5	4	3	2	1	0
Write								Undefined
Read	Device		Address							Manufacturer ID
	Class		Space

84 HP E1351A/53A Register-Based Programming Appendix B