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Setting the Arm
Count
The registers used to set the arm count are listed below.
• Arm count registers
base + 55
16
and base + 57
16
Procedure 1. Load the arm count registers.
A. With the digitizer in the idle state, write the decimal equivalent
of the most significant byte to register 55. Writing the decimal
equivalent of the least significant byte to register 57. You can set
the arm count from 1 to 65,535 arms. For example, to program an
arm count of 20:
MSB LSB
0 0 0 0 0 0 0 0 0 0 0 1 0 1 0 0
0 20
10
0 is written to register 55
20
10
is written to register 57
To program an arm count of 300:
MSB LSB
0 0 0 0 0 0 0 1 0 0 1 0 1 1 0 0
1
10
44
10
1
10
is written to register 55
44
10
is written to register 57
Setting the Arm
Delay
The arm delay is the amount of additional delay to occur from when the
digitizer accepts the arm signal, to when it enters the wait-for-trigger state.
There is always a delay of one reference clock cycle. The registers used to
set the arm delay are listed below.
• Arm Control register
base + 4B
16
• Arm Delay registers
base + 51
16
and base + 53
16
374 Register Programming Appendix C