ZyXEL Communications Omni TA128 - Manual (Page 144)

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O O note: The values used in the example below differ from the actual
values in the S-register and are used for demonstration purposes
only.
Read the value from S38 using ATS38?
Convert it to binary, using the following weight table:
Bit Binary value Decimal value Hexadecimal value
0 00000001 1 $01
1 00000010 2 $02
2 00000100 4 $04
3 00001000 8 $08
4 00010000 16 $10
5 00100000 32 $20
6 01000000 64 $40
7 10000000 128 $80
To set bit 3 to 1 (binary), do a logic OR operation with the value.
Operation Example-1 Example-2
Binary Dec. Hex Binary Dec. Hex.
10001000 136 $88 01000000 64 $40
OR 00001000 8 $08 00001000 8 $08
10001000 136 $88 01001000 72 $48
To set bit 3 to 0 (binary), you must invert the value using a logic
NOT operation and then do an logic AND operation.
NOT 00001000 8 $08 00001000 8 $08
11110111 247 $F7 11110111 247 $F7
AND 10001000 136 $88 01000000 64 $40
10000000 128 $80 01000000 64 $40
Finally, using the result decimal value, issue an ATS38=n to set
the register.