C868_02 Datasheet, PDF (25/244 Pages) Infineon Technologies AG – 8 - Bit CMOS Microcontroller

C868
Memory Organization
3
Memory Organization
The C868 CPU manipulates operands in the following five address spaces:
– up to 8 Kbyte of RAM internal program memory : 8K ROM for C868-1R
: 8K RAM for C868-1S
– 4 Kbyte of internal Self test and Boot ROM
– 256 bytes of internal data memory
– 256 bytes of internal XRAM data memory
– 128 byte special function register area
Figure 3-1 illustrates the memory address spaces of the C868.
Internal ^FFFFH
XRAM
FF00H
1FFFH
Internal
Self Test
and Boot
ROM
(4 KByte)
Internal
0000H
"Code Space"
"Data Space"
indirect
addr.
direct
addr.
Internal
RAM
Special ^FFH
Function
Regs.
80H
7FH
Internal
RAM
00H
"Internal Data Space"
Figure 3-1 C868 Memory Map
The internal Self Test and Boot ROM overlaps the internal program memory in the
address range from 0000_H to 0FFF_H. Depending on the selected operating mode
(chipmode), either internal program memory or the internal Self Test and Boot ROM is
accessed in this address range.
User’s Manual
3-1
V 0.4, 2002-01