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Status Registers
Figure 10-1 illustrates how the different inputs to an S-register (S22 in
this case) are used to select a particular option. Bits 3 and 2 of S22
control speaker options. Some communication software packages may
use the AT command set. For example purposes bit values are arbitrary.
Bit values for S-registers must not be confused with the total register
value. Bit values are counted separately for each option group, called
bit mapping, while the register value is the cumulative decimal or hexa-
decimal total. The decimal value counts all eight bits as a single group.
Hexadecimal values split the bits into two groups of four each. Writing
to an S-register changes the total value. Figure 10-2 illustrates the
difference between decimal calculation and hexadecimal calculation.
Figure 10-1 Changing S-Register Values
10-2
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