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A. Load the pre-arm reading count registers. With the digitizer in
the idle state, write the decimal equivalent of the least significant
byte to register 73. Write the decimal equivalent of the most
significant byte to register 75. You can set the pre-arm reading
count from 3 to 65,535 readings. For example, to program 500
pre-arm readings, a pre-arm reading count of 498 (500 - 2) is loaded
into the registers.
MSB LSB
0 0 0 0 0 0 0 1 1 1 1 1 0 0 1 0
1
10
242
10
242
10
is written to register 73
1 is written to register 75
B. Load the post-arm reading count registers. Write the decimal
equivalent of the least significant byte to register 77. Write the
decimal equivalent of the middle significant byte to register 79.
Write the decimal equivalent of the most significant byte to register
7B. You can set the post-arm reading count from 7 to 16,777,215
readings. For example, to program 100,000 post-arm readings with
no pre-arm readings, a post-arm reading count of 99,997 (100,000 -
3) is loaded into the post-arm registers. (A count of 1 is written to
the pre-arm registers.)
MSB MIDSB LSB
0 0 0 0 0 0 0 1 1 0 0 0 0 1 1 0 1 0 0 1 1 1 0 1
1
10
134
10
157
10
157
10
is written to register 77
134
10
is written to register 79
1
10
is written to register 7B
3. Initialize the sample rate registers.
A. Write the decimal value of 129 to register base +63
16
, and write
the decimal value of 255 to register base +61
16
.
B. Disable reference divider reclocking (for divider values greater
than 100,000 - see Step 4). Set arm control register
(base +4B
16
) bit 4 to ’0’ while retaining the settings of the other bits.
Appendix C Register Programming 383