8XC251SA, SB, SP, SQ USER’S MANUAL
3-18
The following tables list the mnemonics, names, and addresses of the SFRs:
Table 3-6 — Core SFRs
Table 3-7 — I/O Port SFRs
Table 3-8 — Serial I/O SFRs
Table 3-9 — Timer/Counter and Watchdog Timer SFRs
Table 3-10 — Programmable Counter Array (PCA) SFRs
Table 3-6. Core SFRs
Mnemonic Name Address
ACC
†
Accumulator S:E0H
B
†
B Register S:F0H
PSW Program Status Word S:D0H
PSW1 Program Status Word 1 S:D1H
SP
†
Stack Pointer – LSB of SPX S:81H
SPH
†
Stack Pointer High – MSB of SPX S:BEH
DPTR
†
Data Pointer (2 bytes) —
DPL
†
Low Byte of DPTR S:82H
DPH
†
High Byte of DPTR S:83H
DPXL
†
Data Pointer, Extended Low S:84H
PCON Power Control S:87H
IE0 Interrupt Enable Control 0 S:A8H
IPH0 Interrupt Priority Control High 0 S:B7H
IPL0 Interrupt Priority Control Low 0 S:B8H
†
These SFRs can also be accessed by their corresponding registers in the
register file (see Table 3-4 on page 3-15).
Table 3-7. I/O Port SFRs
Mnemonic Name Address
P0 Port 0 S:80H
P1 Port 1 S:90H
P2 Port 2 S:A0H
P3 Port 3 S:B0H
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