T89C51RD2-3CUI-L View Datasheet(PDF) - Atmel Corporation
Part Name
Description
Manufacturer
T89C51RD2-3CUI-L Datasheet PDF : 86 Pages
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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
CCAP0H
CCAP1H CCAPL2H CCAPL3H CCAPL4H
FFh
0000 0000 XXXX XXXX XXXX XXXX XXXX XXXX XXXX XXXX XXXX XXXX
F0h
B
F7h
0000 0000
E8h
P5
CL
CCAP0L
CCAP1L CCAPL2L CCAPL3L CCAPL4L
EFh
1111 1111 0000 0000 XXXX XXXX XXXX XXXX XXXX XXXX XXXX XXXX XXXX XXXX
E0h
ACC
E7h
0000 0000
D8h
CCON
CMOD
CCAPM0 CCAPM1 CCAPM2 CCAPM3 CCAPM4
DFh
00X0 0000 00XX X000 X000 0000 X000 0000 X000 0000 X000 0000 X000 0000
D0h
PSW
FCON
EECON
EETIM
D7h
0000 0000 XXXX 0000 XXXX XX00 0000 0000
C8h T2CON
T2MOD
RCAP2L
RCAP2H
TL2
TH2
CFh
0000 0000 XXXX XX00 0000 0000 0000 0000 0000 0000 0000 0000
C0h
P4
1111 1111
P5
C7h
1111 1111
B8h
IP
SADEN
BFh
X000 000 0000 0000
B0h
P3
1111 1111
IPH
B7h
X000 0000
A8h
IE
SADDR
AFh
0000 0000 0000 0000
A0h
P2
1111 1111
AUXR1
XXXX 00X0
WDTRST WDTPRG A7h
XXXX XXXX XXXX X000
98h
SCON
SBUF
9Fh
0000 0000 XXXX XXXX
90h
P1
97h
1111 1111
88h
TCON
0000 0000
TMOD
0000 0000
TL0
0000 0000
TL1
0000 0000
TH0
0000 0000
TH1
AUXR
CKCON 8Fh
0000 0000 XX0X 1000 X000 0000
80h
P0
1111 1111
SP
0000 0111
DPL
0000 0000
DPH
0000 0000
PCON
87h
00X1 0000
0/8
1/9
2/A
3/B
4/C
5/D
6/E
7/F
Rev. F - 15 February, 2001
3
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