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6-2
Programming
A read of any address in the range Base
Address
+0h to Base
Address
+Bh
performs an update of any DACs jumpered for simultaneous update.
Users of IBM PC AT or equivalent computers should note that all ports
are 8-bit (one byte) and should perform byte read/write operations rather
than word (16-bit) operations.
Data Format
Data is written the DACs in true, binary, right-justified form, as shown in
Table 6-2.
For unipolar ranges (0 to full scale), coding is true binary, as follows:
●
0000 0000 0000
Zero
●
1000 0000 0000
1/2 scale
●
1111 1111 1111
+full scale (minus one bit)
For bipolar ranges (
−
full Scale to +full Scale), coding is offset binary, as
follows:
●
0000 0000 0000
−
full scale
●
1000 0000 0000
Zero
●
1111 1111 1111
+full scale (minus one bit)
Table 6-2. DAC Data Format
Address
D7
D6
D5
D4
D3
D2
D1
D0
Low byte (Base
Address
+Even)
B7
B6
B5
B4
B3
B2
B1
B0
(LSB
1
)
Notes
1
LSB = least significant bit
High byte
(Base Address
+Odd)
x
2
2
x = value irrelevant
x
x
x
B11
(MSB
3
)
3
MSB = most significant bit
B10
B9
B8
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