A/D Data Registers - Base+0/1; Software A/D Trigger - Base+0 - Advantech PCM-3718 Series User Manual

4.1 A/D Data Registers - BASE+0/1

Two read-only registers at BASE+0 and BASE+1 hold A/D conversion
data. The 12 bits of data from the A/D conversion are stored in BASE+1
bit 7 to bit 0 and BASE+0 bit 7 to bit 4. BASE+0 bits 3 to 0 store the
source A/D channel number.
BASE+0 (read only) - A/D low byte & channel number
Bit
Value AD3
BASE+1 (read only) - A/D high byte
Bit
Value AD11
AD11 to AD0
C3 to C0

4.2 Software A/D Trigger - BASE+0

You can trigger an A/D conversion from software, the module's onboard
pacer or from an external pulse. Bits 1 and 0 of register BASE+9 (shown
on pages 31~32) select the trigger source. If you select software
triggering, a write to the register BASE+0 with any value will trigger an
A/D conversion.
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D7 D6 D5
AD2 AD1
D7 D6 D5
AD10 AD9
Analog to digital data. AD0 is the least significant bit
(LSB) of the A/D data, and AD11 is the most
significant bit (MSB)
A/D channel number from which the data is derived.
C3 is the MSB and C0 is the LSB
D4 D3 D2
AD0 C3 C2
D4 D3 D2
AD8 AD7 AD6
31
D1 D0
C1 C0
D1 D0
AD5 AD4
Chapter 4