Measurement Computing CIO-DAS16/330 - Manual (Page 13)

Table 4-1. Bit Weights
80 128 7
40 64 6
20 32 5
10 16 4
8 8 3
4 4 2
2 2 1
1 1 0
HEX VALUE DECIMAL VALUE BIT POSITION
To write control or data to a register, the individual bits are set to 0 or 1 then combined to form a Byte. The method of
programming required to set/read bits from bytes is beyond the scope of this manual.
The board registers and their function are listed on Table 4-2.
Table 4-2. Register Functions
Advanced features counter control
(8254) None. No read back on 8254 BASE + 19
CTR 2. Pre-trigger counter Pre-trigger count BASE + 18
CTR 1. Total counter (1/2) Total sample LS Counter BASE + 17
CTR 0. Total counter (1/2) Total sample MS Counter BASE + 16
Upper nibble, enhanced features
control Upper nibble, enhanced features
status BASE + 11
ENHANCED MODE ONLY
Pacer Clock Control (8254) None. No read back on 8254 BASE + 15
CTR 2 Data - A/D Pacer CTR2 Data - A/D Pacer Clock BASE + 14
CTR 1 Data - A/D Pacer CTR 1 Data - A/D Pacer Clock BASE + 13
Counter 0 Data Counter 0 Data BASE + 12
Gain, Enhanced Mode, DT Conn. Gain setting read-back BASE + 11
Pacer clock control register None BASE + 10
Set DMA, INT etc DMA, Interrupt & Trigger Control BASE + 9
None Status EOC, UNI/BIP, Current Ch. BASE + 8
None None BASE + 7
None None BASE + 6
None None BASE + 5
None None BASE + 4
Digital 4 Bit Output Digital 4 Bit Input BASE + 3
Channel MUX Set, Clear FIFO Channel MUX BASE + 2
None A/D Bits 1 (MSB) - 8 BASE + 1
Start A/D Conversion A/D Bits 9-12 (LSB) & Channel # BASE
WRITE FUNCTION READ FUNCTION - ALL MODES ADDRESS
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