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Chapter 4 Register Structure and Format 25
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
D7
D6
D5
D4
D3
D2
D1
D0
Value AD3
AD2
AD1
AD0
C3
C2
C1
C0
BASE+1 (read only) - A/D high byte
Bit
D7
D6
D5
D4
D3
D2
D1
D0
Value AD11 AD10 AD9
AD8
AD7
AD6
AD5
AD4
AD11 to AD0 Analog to digital data. AD0 is the least significant bit
(LSB) of the A/D data, and AD11 is the most signifi-
cant bit (MSB)
C3 to C0
A/D channel number from which the data is derived.
C3 is the MSB and C0 is the LSB
4.2 Software A/D Trigger - BASE+0
You can trigger an A/D conversion from software, the module’s on-
board 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.
Summary of Contents for 3718HG
Page 1: ...PCM 3718H 3718HG PC 104 12 bit DAS Module with Programmable Gain User s manual ...
Page 2: ......
Page 5: ...1 General Information CHAPT ER ...
Page 13: ...2 Installation CHAPT ER ...
Page 21: ...3 Signal Connections CHAPT ER ...
Page 26: ...22 PCM 3718H 3718HG User s Manual ...
Page 27: ...4 Register Structure and Format CHAPT ER ...
Page 38: ...34 PCM 3718H 3718HG User s Manual ...
Page 39: ...5 A D Conversion CHAPT ER ...
Page 45: ...6 Digital Input Output CHAPT ER ...
Page 47: ...7 Programmable Pacer CHAPT ER ...
Page 57: ...8 Direct Memory Access Operation CHAPT ER ...
Page 60: ...56 PCM 3718H 3718HG User s Manual ...
Page 61: ...9 Calibration CHAPT ER ...
Page 64: ...60 PCM 3718H 3718HG User s Manual ...