P89V51RB2 Datasheet, PDF (11/77 Pages) NXP Semiconductors – 8-bit 80C51 5 V low power 16/32/64 kB Flash microcontroller with 1 kB RAM

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Table 4: Special function registers
* indicates SFRs that are bit addressable.
Name
Description
SFR
addr.
MSB
Bit functions and addresses
LSB
Bit address
E7
E6
E5
E4
E3
E2
E1
E0
ACC*
Accumulator
E0H
AUXR
Auxiliary function register
8EH
-
-
-
-
-
-
EXTRAM
AO
AUXR1
Auxiliary function register 1
A2H
-
-
-
GF2
0
-
DPS
Bit address
F7
F6
F5
F4
F3
F2
F1
F0
B*
B register
F0H
CCAP0H Module 0 Capture HIGH
FAH
CCAP1H Module 1 Capture HIGH
FBH
CCAP2H Module 2 Capture HIGH
FCH
CCAP3H Module 3 Capture HIGH
FDH
CCAP4H Module 4 Capture HIGH
FEH
CCAP0L Module 0 Capture LOW
EAH
CCAP1L Module 1 Capture LOW
EBH
CCAP2L Module 2 Capture LOW
ECH
CCAP3L Module 3 Capture LOW
EDH
CCAP4L Module 4 Capture LOW
EEH
CCAPM0 Module 0 Mode
DAH
-
ECOM_0 CAPP_0 CAPN_0 MAT_0 TOG_0 PWM_0 ECCF_0
CCAPM1 Module 1 Mode
DBH
-
ECOM_1 CAPP_1 CAPN_1 MAT_1 TOG_1 PWM_1 ECCF_1
CCAPM2 Module 2 Mode
DCH
-
ECOM_2 CAPP_2 CAPN_2 MAT_2 TOG_2 PWM_2 ECCF_2
CCAPM3 Module 3 Mode
DDH
-
ECOM_3 CAPP_3 CAPN_3 MAT_3 TOG_3 PWM_3 ECCF_3
CCAPM4 Module 4 Mode
DEH
-
ECOM_4 CAPP_4 CAPN_4 MAT_4 TOG_4 PWM_4 ECCF_4
Bit address DF
DE
DD
DC
DB
DA
D9
D8
CCON*
PCA Counter Control
D8H
CF
CR
-
CCF4
CCF3
CCF2
CCF1
CCF0
CH
PCA Counter HIGH
F9H
CL
PCA Counter LOW
E9H
CMOD
PCA Counter Mode
D9H
CIDL
WDTE
-
-
-
CPS1
CPS0
ECF
DPTR
Data Pointer (2 bytes)
DPH
Data Pointer HIGH
83H
DPL
Data Pointer LOW
82H