Rainbow Electronics T89C51RD2 - Manual (Page 3)

Rev. F - 15 February, 2001 3
T89C51RD2
4. SFR Mapping
The Special Function Registers (SFRs) of the T89C51RD2 fall into the following categories:
•
C51 core registers: ACC, B, DPH, DPL, PSW, SP, AUXR1
•
I/O port registers: P0, P1, P2, P3, P4, P5
•
Timer registers: T2CON, T2MOD, TCON, TH0, TH1, TH2, TMOD, TL0, TL1, TL2, RCAP2L, RCAP2H
•
Serial I/O port registers: SADDR, SADEN, SBUF, SCON
•
Power and clock control registers: PCON
•
Hardware Watchdog Timer register: WDTRST, WDTPRG
•
Interrupt system registers: IE, IP, IPH
•
Flash and EEPROM registers: FCON, EECON, EETIM
•
Others: AUXR, AUXR1, CKCON
Table below shows all SFRs with their address and their reset value.
Bit
address-
able
Non Bit addressable
0/8 1/9 2/A 3/B 4/C 5/D 6/E 7/F
F8h
CH
0000 0000
CCAP0H
XXXX XXXX
CCAP1H
XXXX XXXX
CCAPL2H
XXXX XXXX
CCAPL3H
XXXX XXXX
CCAPL4H
XXXX XXXX
FFh
F0h
B
0000 0000
F7h
E8h
P5
1111 1111
CL
0000 0000
CCAP0L
XXXX XXXX
CCAP1L
XXXX XXXX
CCAPL2L
XXXX XXXX
CCAPL3L
XXXX XXXX
CCAPL4L
XXXX XXXX
EFh
E0h
ACC
0000 0000
E7h
D8h
CCON
00X0 0000
CMOD
00XX X000
CCAPM0
X000 0000
CCAPM1
X000 0000
CCAPM2
X000 0000
CCAPM3
X000 0000
CCAPM4
X000 0000
DFh
D0h
PSW
0000 0000
FCON
XXXX 0000
EECON
XXXX XX00
EETIM
0000 0000
D7h
C8h
T2CON
0000 0000
T2MOD
XXXX XX00
RCAP2L
0000 0000
RCAP2H
0000 0000
TL2
0000 0000
TH2
0000 0000
CFh
C0h
P4
1111 1111
P5
1111 1111
C7h
B8h
IP
X000 000
SADEN
0000 0000
BFh
B0h
P3
1111 1111
IPH
X000 0000
B7h
A8h
IE
0000 0000
SADDR
0000 0000
AFh
A0h
P2
1111 1111
AUXR1
XXXX 00X0
WDTRST
XXXX XXXX
WDTPRG
XXXX X000
A7h
98h
SCON
0000 0000
SBUF
XXXX XXXX
9Fh
90h
P1
1111 1111
97h
88h
TCON
0000 0000
TMOD
0000 0000
TL0
0000 0000
TL1
0000 0000
TH0
0000 0000
TH1
0000 0000
AUXR
XX0X 1000
CKCON
X000 0000
8Fh
80h
P0
1111 1111
SP
0000 0111
DPL
0000 0000
DPH
0000 0000
PCON
00X1 0000
87h
0/8 1/9 2/A 3/B 4/C 5/D 6/E 7/F