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C517A_99 Datasheet, PDF (27/218 Pages) Siemens Semiconductor Group – 8-Bit CMOS Microcontroller
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C517A
3 Memory Organization
The C517A 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
– 2K bytes of internal XRAM data memory
– a 128 byte special function register area
Figure 3-1 illustrates the memory address spaces of the C517A.
FFFF H
ext.
int.
(XMAP0 = 0)
FFFF H
ext.
(XMAP0 = 1)
8000 H
7FFF H
F800 H
F7FF H
int.
ext.
ext.
(EA = 1)
(EA = 0)
"Code Space"
0000 H
0000 H
"Data Space"
Indirect
Address
Direct
Address
FF H
FF H
Internal
RAM
80 H
Special
Function
Regs. 80 H
7F H
Internal
RAM
00 H
"Internal Data Space"
MCB03321
Figure 3-1
C517A Memory Map
Semiconductor Group
3-1
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