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Semiconductor Group 3-1

Memory Organization

C501

3 Memory Organization

The C501 CPU manipulates operands in the following four address spaces:

– up to 64 Kbyte of internal/external program memory

– up to 64 Kbyte of external data memory

– 256 bytes of internal data memory

– a 128 byte special function register area

Figure 3-1 illustrates the memory address spaces of the C501.

Figure 3-1

C501 Memory Map

MCD03224

External

FFFF

"Code Space"

"Data Space" "Internal Data Space"

0000

RAM

Internal

RAM

Function

Special

Direct

Address

Indirect

(EA = 0)(EA = 1)

Internal

External

FFFF

External

0000

2000

1FFF

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 120 121

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Siemens EF 88H Series Manual de usuario Pagina 22