C517A Datasheet, PDF (18/72 Pages) Siemens Semiconductor Group – 8-Bit CMOS Microcontroller

C517A
Memory Organization
The C517A CPU manipulates operands in the following five address spaces:
– up to 64 Kbyte of program memory (32K on-chip program memory for C517A-4R)
– 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 6 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 6
C517A Memory Map
Semiconductor Group
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