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Card Control
Register
Bit
Address
READ
Base + 1E
16
WRITE
Note
141
HP E1418A Register-Based Programming
The Card Control Register allows for access to the A24 address space from
the A16 address space. It also provides access to the non-volatile memory.
15
14
13
12
11
10
Unused
VPPEN: Writing a one (1) to this field enables the non-volatile memory to be
altered. Writing a zero (0) disables updates or erasures of the non-volatile
memory. Non-volatile memory is located at base + 100
The VPPEN field enables or disables the programming voltage needed to
change the contents of the non-volatile memory. A physical jumper on the
main printed circuit board must also be moved to the CAL position before
the contents of the non-volatile memory can be altered.
A24 Window: Writing a value to this field sets which 16 register-wide portion
of A24 registers can be accessed via A16 registers 20
mapped for each value are shown below and in Figure B-3 on page 117.
A24 Window Value
0
16
1
16
2
16
3
16
4
16
5
16
6
16
7
16
8
16
9
16
A
16
B
16
C
16
D
16
E
16
F
16
09
08
07
06
05
VPPEN
A24 Registers Mapped
A16 00
through 1E
16
A16 20
through 3E
16
Main_DAC Immediate Registers
Main_DAC Triggered Registers
Offset_DAC Registers
Gain_DAC Registers
Undefined
Undefined
Voltage Offset Cal Memory (non-volatile)
Voltage Gain Cal Memory (non-volatile)
Current Offset Cal Memory (non-volatile)
Current Gain Cal Memory (non-volatile)
Cal and Configuration Registers (non-volatile)
Undefined Cal Memory (non-volatile)
Undefined Cal Memory (non-volatile)
Undefined Cal Memory (non-volatile)
04
03
02
01
00
A24 Window
to base + 200
.
16
16
to 3E
. The registers
16
16
16
16
Appendix B
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