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8XC251SA, SB, SP, SQ USER'S MANUAL
Instructions in the MCS 51 architecture use the accumulator as the primary register for data
moves and calculations. However, in the MCS 251 architecture, any of registers R1–R15 can
serve for these tasks†. As a result, the accumulator does not play the central role that it has in
MCS 51 microcontrollers.
60
DR60 = Extended Stack Pointer, SPX
DPXL
56
DR56 = Extended Data Pointer, DPX
R10, B Register
Figure 3-8. Dedicated Registers in the Register File and their Corresponding SFRs
† Bits in the PSW and PSW1 registers reflect the status of the accumulator. There are no equivalent status
indicators for the other registers.
3-14
Register File
Stack Pointer, High
Stack Pointer
SPH
SP
61
62
63
Data Pointer Extended, Low
Data Pointer, High
Data Pointer, Low
DPH
DPL
57
58
59
ACC
B
R11, Accumulator, ACC
SFRs
S:BEH
SPH
S:81H
SP
S:84H
DPXL
DPH
S:83H
S:82H
DPL
B
S:F0H
ACC
S:E0H
A4152-02
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