
8
AT89C51ID2
4289C–8051–11/05
Table 11. Two-Wire Interface Controller SFRs
Mnemonic
Add
Name
765432
10
SSCON
93h
Synchronous Serial control
SSCR2
SSPE
SSSTA
SSSTO
SSI
SSAA
SSCR1
SSCR0
SSCS
94h
Synchronous Serial Status
SSC4
SSC3
SSC2
SSC1
SSC0
0
SSDAT
95h
Synchronous Serial Data
SSD7
SSD6
SSD5
SSD4
SSD3
SSD2
SSD1
SSD0
SSADR
96h
Synchronous Serial Address
SSA7
SSA6
SSA5
SSA4
SSA3
SSA2
SSA1
SSGC
Table 12. Keyboard Interface SFRs
Mnemonic
Add
Name
765432
10
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 13. EEPROM data Memory SFR
Mnemonic
Add
Name
765432
10
EECON
D2h
EEPROM Data Control
EEE
EEBUSY