sak-c868p-1rr Infineon Technologies Corporation, sak-c868p-1rr Datasheet - Page 30
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sak-c868p-1rr
Manufacturer Part Number
sak-c868p-1rr
Description
8 - Bit Cmos Microcontroller
Manufacturer
Infineon Technologies Corporation
Datasheet
1.SAK-C868P-1RR.pdf
(266 pages)
- Current page: 30 of 266
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3.3.2.1
The normal mode is the standard 8051 compatible operating mode of the C800.
Table 3-2
Memory Space
Code Space
Internal Data Space
3.3.2.2
In the bootstrap mode, code is fetched from the boot-ROM when PC is less than 1000
A dedicated 4 Kbyte boot-ROM is implemented to support this function. The actual code
inside the boot-ROM could be made up of various components such as programming
code for RAM module, download code, initialization routines or diagnostic software.
The bootstrap mode can be entered via one of the possible ways:
The exit from the bootstrap mode is possible via one of the possible ways:
The memory mapping for this mode is shown in the
Table 3-3
Memory Space
Code Space
Internal Data Space
Once in the bootstrap mode, the on-chip XRAM is always enabled irrespective of the
XMAP0 bit in SFR SYSCON0. Exiting the bootstrap mode via software, the on-chip
XRAM access returns to the state prior to entering this mode, depending on XMAP0.
3.3.2.3
In the XRAM modes, code and data memory are swapped and in this case the code can
be fetched from the data space. This is useful for running diagnostic software.
The entry and exit into this mode is always through the special software unlock
sequence. The XRAM mode could be entered from either the normal mode or the
User’s Manual
– hardware start-up sequence, or
– software entry using special unlock sequence
– hardware reset, or
–
software using special unlock sequence
Normal Mode
Bootstrap Mode
XRAM Modes
Normal Memory Configuration for C868
Bootstrap Memory Configuration for C868-1R
Memory Boundary
RAM/ROM: 0000
XRAM: FF00
Memory Boundary
Boot ROM: 0000
XRAM: FF00
H
H
to FFFF
to FFFF
H
3-6
H
to 0FFF
to 1FFF
H
H
, ROM/RAM: 0000
H
H
Table 3-3
Memory Organization
H
to 1FFF
V 1.0, 2003-01
H
C868
H
.
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