User manual

PCL-818 Series User Manual 48

C.4 Software A/D Trigger — BASE+00H

You can trigger an A/D conversion from software, the card's on-board

pacer or an external pulse. If you select software triggering, a write to the

Bits 1 and 0 of register BASE+09H select the trigger source. See pages

57 and 58 for BASE+09H register layout and programming information.

Table C-3 Register for Software A/D Trigger

C.5 A/D RangeControl — BASE+01H

Each A/D channel has its own individual input range, controlled by a

range code stored in on-board RAM. If you want to change the range

code for a given channel, select the channel as the start channel in register

BASE+02H, MUX scan (described in the next section), then write the

range code to bits 0 to 3 of BASE+01H.

Table C-4 Register for A/D Range Control

G3 ~ G0 A/D range control

G0 the least significant bit (LSB) of the A/D range

G3 the most significant bit (MSB)

Write Software A/D trigger

Bit # 7 6 5 4 3 2 1 0

BASE + 00H X X X X X X X X

Write A/D range control

Bit # 7 6 5 4 3 2 1 0

BASE + 01H X X X X G3* G2* G1 G0