sak-c868p-1rr Infineon Technologies Corporation, sak-c868p-1rr Datasheet - Page 31

• Manufacturer Part Number: sak-c868p-1rr
• Description: 8 - Bit Cmos Microcontroller
• Manufacturer: Infineon Technologies Corporation

bootstrap mode.
respectively in an example.
Table 3-4
Memory Space
Code Space
Data Space
Table 3-5
Memory Space
Code Space
Data Space
The on-chip XRAM, which is in the upper part of the 64 KB data space, is always enabled
in this mode for code access irrespective of the XMAP0 bit. The external data space also
becomes code space.
The actual physical sizes of the various memory types as mentioned above are product
specific. In the C868, the external accesses are prohibited. For code spaces, appropriate
branch instructions must therefore be inserted.
The on-chip data space is accessible, as usual, via MOVX instructions. The on-chip data
memory accesses to RAM/ROM are restricted by the physical memory available in the
respective product. For the C868-1R, the option to disable the access to the ROM is
selectable upon request. This option is reflected in SFR Version bit 7(1 for access
disabled).
An exit from the XRAM mode is possible by software only. In this mode the on-chip
XRAM is disabled as data space irrespective of XMAP0 bit in SFR SYSCON0. It will
remain disabled after exit from XRAM mode unless the XMAP0 had been cleared prior
to entering this mode.
User’s Manual
Normal XRAM Mode
Bootstrap XRAM Mode
Table 3-4
Memory Boundary
XRAM: FF00
ROM/RAM: 0000
Memory Boundary
Boot ROM: 0000
XRAM: FF00
RAM/ROM: 0000
and
H
H
Table 3-5
to FFFF
to FFFF
H
H
H
to 0FFF
to 1FFF
to 1FFF
3-7
H
H
show the various memory configurations
H
H
H
Memory Organization
V 1.0, 2003-01
C868