8
U2121A-101 Operating Guide
IO mapping
There are three main control bits used in the U2121A- 101 as shown
in tables below. These control bits also refers to the U2121A control
bit status.
Table 4
Output enable/disable control
Control Stage
Control Bit, DO14
Description
Output disabled
OFF (0)
To disable all outputs in U2121A
-
101
Output enabled
ON (0)
To enable all outputs in U2121A
-
101
Table 5
Position information read back control
RF Switches
Control Bit
Description
D16
D15
8765x and 8762/3/4
OFF (0)
ON (1)
Read position information from 8765x and
8762/3/4 series switches
N181x
ON (1)
OFF (0)
Read position information from N181x
series switches
WA RN I N G
DO NOT set both D15 and D16 control bits to ON stage!
U2931A Operating Guide.book Page 8 Tuesday, June 10, 2008 10:17 AM
