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參數(shù)資料
| 型號： | XC866L-4RR |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash |
| 中文描述： | 8位微控制器與2/4/8K字節(jié)在系統(tǒng)可編程閃存 |
| 文件頁數(shù)： | 19/108頁 |
| 文件大?。?/td> | 979K |
| 代理商： | XC866L-4RR |
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XC866
Functional Description
Data Sheet
15
V1.0, 2006-02
3.2.2
Special Function Register
The Special Function Registers (SFRs) occupy direct internal data memory space in the
range 80
H
to FF
H
. All registers, except the program counter, reside in the SFR area. The
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 by Mapping
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
H
to FF
H
, bringing the number
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
H
. To access SFRs in the mapped area, bit RMAP in SFR
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
Figure 7
.
SYSCON0
System Control Register 0 Reset Value: 00
H
7
6
5
4
3
2
1
0
0
1
0
RMAP
r
rw
r
rw
Field
RMAP
Bits
0
Type Description
rw
Special Function Register Map Control
0
The access to the standard SFR area is
enabled.
1
The access to the mapped SFR area is
enabled.
rw
Reserved
Returns the last value if read; should be written
with 1.
r
Reserved
Returns 0 if read; should be written with 0.
1
2
0
1,[7:3]
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