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5 S-REGISTERS
This chapter discusses the meaning and content of the S-registers. A large number of these S-
registers have a specific technical meaning. It is therefore not recommended to change the
setting of an S register if you do not know what the consequences are.
A number of S-registers have one meaning (function). Other registers have several functions and
are called bit mapped registers. In these registers, commands are set at bit level. Most bit-
mapped S registers are read-only. The appropriate AT command which controls the relevant bits
in the S-register should be used to change the value.
The following paragraph explains what bit mapped means. In paragraph 4.2, a list of the meaning
of each S register is given. The registers marked with * are stored in the permanent memory.
5.1 Bit Mapped S-registers
With the bit mapped S registers, a function is switched on or off per bit. “1”means that the bit is
on or is set; “0”means that the bit is off or is reset.
These bits from the binary system represent a decimal value. Bit 7=128, 6=64, 5=32, 4=16, 3=8, 2=4,
1=2 en 0=1.
When you add the decimal value of the bits that are on (1), the result is the value which has to be
put into the register. Bit Mapped registers can only be read.
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