Table 11 shows all SFRs with their address and their reset value.
SFR Mapping
Bit
addressable
0/8
F8h
B
0000 0000
CL
0000 0000
ACC
0000 0000
CCON
00X0 0000
PSW
0000 0000
T2CON
0000 0000
CMOD
00XX X000
FCON
(1)
XXXX 0000
T2MOD
XXXX XX00
RCAP2L
0000 0000
RCAP2H
0000 0000
SPCON
0001 0100
IPL0
X000 000
P3
1111 1111
IEN0
0000 0000
P2
1111 1111
SCON
0000 0000
P1
1111 1111
TCON
0000 0000
P0
1111 1111
0/8
1.
TMOD
0000 0000
SP
0000 0111
1/9
TL0
0000 0000
DPL
0000 0000
2/A
TL1
0000 0000
DPH
0000 0000
3/B
4/C
5/D
6/E
TH0
0000 0000
TH1
0000 0000
AUXR
XX0X 0000
SBUF
XXXX XXXX
SADEN
0000 0000
IEN1
XXXXX 000
SADDR
0000 0000
AUXR1
XXXXX0X0
BRL
0000 0000
BDRCON
XXX0 0000
KBLS
0000 0000
KBE
0000 0000
WDTRST
XXXX XXXX
KBF
0000 0000
CKRL
1111 1111
CKCON0
0000 0000
PCON
00X1 0000
7/F
IPL1
XXXXX000
IPH1
XXXX X000
IPH0
X000 0000
CKCON1
XXXX XXX0
WDTPRG
XXXX X000
TL2
0000 0000
SPSTA
0000 0000
TH2
0000 0000
SPDAT
XXXX XXXX
CCAPM0
X000 0000
CCAPM1
X000 0000
CCAPM2
X000 0000
CCAPM3
X000 0000
CCAPM4
X000 0000
CCAP0L
XXXX XXXX
CCAP1L
XXXX XXXX
CCAPL2L
XXXX XXXX
CCAPL3L
XXXX XXXX
CCAPL4L
XXXX XXXX
1/9
CH
0000 0000
2/A
CCAP0H
XXXX
3/B
CCAP1H
XXXX
Non Bit addressable
4/C
CCAPL2H
XXXX
5/D
CCAPL3H
XXXX
6/E
CCAPL4H
XXXX
7/F
FFh
F0h
F7h
E8h
EFh
E0h
E7h
D8h
D0h
C8h
C0h
DFh
D7h
CFh
C7h
B8h
BFh
B0h
B7h
A8h
AFh
A0h
A7h
98h
9Fh
90h
97h
88h
8Fh
80h
87h
FCON access is reserved for the Flash API and ISP software.
Reserved
8
AT89C51RB2/RC2
4180E–8051–10/06
ATMEL [ ATMEL CORPORATION ]
