sak-xc888clm-8ffa Infineon Technologies Corporation, sak-xc888clm-8ffa Datasheet - Page 25
sak-xc888clm-8ffa
Manufacturer Part Number
sak-xc888clm-8ffa
Description
High Performance 8-bit Microcontroller With On-chip Flash Memory And Can
Manufacturer
Infineon Technologies Corporation
Datasheet
1.SAK-XC888CLM-8FFA.pdf
(119 pages)
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3.2.2
The Special Function Registers (SFRs) occupy direct internal data memory space in the
range 80
SFRs include pointers and registers that provide an interface between the CPU and the
on-chip peripherals. As the 128-SFR range is less than the total number of registers
required, address extension mechanisms are required to increase the number of
addressable SFRs. The address extension mechanisms include:
• Mapping
• Paging
3.2.2.1
Address extension is performed at the system level by mapping. The SFR area is
extended into two portions: the standard (non-mapped) SFR area and the mapped SFR
area. Each portion supports the same address range 80
of addressable SFRs to 256. The extended address range is not directly controlled by
the CPU instruction itself, but is derived from bit RMAP in the system control register
SYSCON0 at address 8F
SYSCON0 must be set. Alternatively, the SFRs in the standard area can be accessed
by clearing bit RMAP. The SFR area can be selected as shown in
SYSCON0
System Control Register 0
Field
RMAP
0
Data Sheet
Prelimary
7
H
to FF
Special Function Register
Address Extension by Mapping
The functions of the shaded bits are not described here
6
0
H
r
. All registers, except the program counter, reside in the SFR area. The
Bits
0
[7:5],
[3:1]
H
5
. To access SFRs in the mapped area, bit RMAP in SFR
Type Description
rw
r
IMODE
Special Function Register Map Control
0
1
Reserved
Returns 0 if read; should be written with 0.
rw
4
The access to the standard SFR area is
enabled.
The access to the mapped SFR area is
enabled.
21
3
H
2
to FF
0
r
Functional Description
H
, bringing the number
Figure
XC886/888CLM
Reset Value: 00
1
8.
V0.1, 2006-02
RMAP
rw
0
H
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