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Semiconductor Group 3-3

Memory Organization

C501

3.4 Special Function Registers

All registers, except the program counter and the four general purpose register banks, reside in the

special function register area.

The 27 special function register (SFR) include pointers and registers that provide an interface

between the CPU and the other on-chip peripherals. There are also 128 directly addressable bits

within the SFR area.

All SFRs are listed in table 3-1 and table 3-2.

In table 3-2 they are organized in groups which refer to the functional blocks of the C501. Table 3-3

illustrates the contents (bits) of the SFRs.

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 120 121

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Siemens EF 88H Series Manual de usuario Pagina 24