Datasheet

7
4235K–8051–05/08
AT89C51RD2/ED2
shows all SFRs with their address and their reset value.
Table 3-9. Keyboard Interface SFRs
Mnemonic Add Name 7 6 5 4 3 2 1 0
KBLS 9Ch Keyboard Level Selector KBLS7 KBLS6 KBLS5 KBLS4 KBLS3 KBLS2 KBLS1 KBLS0
KBE 9Dh Keyboard Input Enable KBE7 KBE6 KBE5 KBE4 KBE3 KBE2 KBE1 KBE0
KBF 9Eh Keyboard Flag Register KBF7 KBF6 KBF5 KBF4 KBF3 KBF2 KBF1 KBF0
Table 3-10. EEPROM data Memory SFR (AT89C51ED2 only)
Mnemonic Add Name 7 6 5 4 3 2 1 0
EECON D2h EEPROM Data Control EEE EEBUSY
Table 3-11. SFR Mapping
Bit
Addressable 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
CCAP2H
XXXX XXXX
CCAP3H
XXXX XXXX
CCAP4H
XXXX XXXX
FFh
F0h
B
0000 0000
F7h
E8h
P5 bit
addressable
1111 1111
CL
0000 0000
CCAP0L
XXXX XXXX
CCAP1L
XXXX XXXX
CCAP2L
XXXX XXXX
CCAP3L
XXXX XXXX
CCAP4L
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
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
SPCON
0001 0100
SPSTA
0000 0000
SPDAT
XXXX XXXX
P5 byte
Addressable
1111 1111
C7h
B8h
IPL0
X000 000
SADEN
0000 0000
BFh
B0h
P3
1111 1111
IEN1
XXXX X000
IPL1
XXXX X000
IPH1
XXXX X000
IPH0
X000 0000
B7h
A8h
IEN0
0000 0000
SADDR
0000 0000
CKCON1
XXXX XXX0
AFh