User manual

Page 5-3
Manual MPCI-DA12-16.Dh
Address Write Read
Base + 20 Digital I/O Port A, Output Digital I/O Port A, Input
Base + 21 Digital I/O Port B, Output Digital I/O Port B, Input
Base + 22 Digital I/O Port C, Output Digital I/O Port C, Input
Base + 23 Digital I/O Control Byte
Base + 24 Counter/Timer 0 Counter/Timer 0
Base + 25 Counter/Timer 1 Counter/Timer 1
Base + 26 Counter/Timer 2 Counter/Timer 2
Base + 27 Counter/Timer Control Register Counter/Timer Control Register
Table 5-2: I/O Address Map for the Digital I/O and Counter/Timers
BIT
D7 D6 D5 D4 D3 D2 D1 D0
Low Byte
B7 B6 B5 B4 B3 B2 B1 B0
High Byte
x x x x B11 B10 B9 B8
Table 5-3: DAC Data Format
For Unipolar ranges: For Unipolar ranges, data are in true binary form.
XXXX 0000 0000 0000 = Zero
XXXX 1000 0000 0000 = 1/2 Scale
XXXX 1111 1111 1111 = Full Scale
| |
MSB or B11 <----| |----> B0 or LSB
For Bipolar ranges: For Bipolar ranges, data are in offset binary form.
XXXX 0000 0000 0000 = -Full Scale
XXXX 1000 0000 0000 = Zero
XXXX 1111 1111 1111 = +Full Scale
| |
MSB or B11 <----| |----> B0 or LSB