TSC80251 TEMIC [TEMIC Semiconductors], TSC80251 Datasheet - Page 22

• Manufacturer Part Number: TSC80251
• Manufacturer: TEMIC [TEMIC Semiconductors]

TSC80251
3.4.2. Dedicated Registers
The register file has four dedicated registers :
These registers are located in the register file; however, R10, R11 and some bytes of DR56 and DR60 are also accessible
as SFRs. The bytes of DPX and SPX can be accessed in the register file only by addressing the dword registers. The
dedicated registers in the register file and their corresponding SFRs are illustrated in Figure 3.7. and listed in
Table 3.3.
3.6
PSW bits RS1:0 select one bank
to be accessed via the register file.
Stack Pointer
(SPX)
(SPX)
Data Pointer
(DPX)
(DPX)
Accumulator (A Register)
B Register
R10 is the B–register.
R11 is the accumulator (A).
DR56 is the extended data pointer, DPX.
DR60 is the extended stack pointer, SPX.
Table 3.3. Dedicated Registers in the Register File and their Corresponding SFRs
0
0
1
0
Stack Pointer, High
Stack Pointer, Low
Data Pointer, Extended Low
DPTR
1
0
8
0
2
1
Name
2
1
1
3
2
3
2
Data Pointer, High
Data Pointer, Low
2
4
3
Register File
Figure 3.6. Register File Locations 0-7
–
–
–
4
3
3
4
5
Register File
Banks 0-3
5
4
4
6
5
6
5
5
7
6
7
6
6
7
63
7
Mnemonic
7
DPXL
DPH
SPH
DPL
SP
A
B
–
–
–
00:0020h
18h 1Fh
10h 17h
08h 0Fh
00h 07h
DR60
DR60
DR56
DR56
Reg.
R10
R11
Memory Address Space
Location
60
61
62
63
56
57
58
59
10
11
FF:FFFFh
Mnemonic
DPXL
Rev. C – May 7, 1999
DPH
DPL
SPH
SP
A
B
–
–
–
SFRs
Banks 0-3
accessible
in memory
address space
Address
S:BEh
S:E0h
S:81h
S:84h
S:83h
S:82h
S:F0h
–
–
–