Datasheet

66
AT89C51RB2/RC2
4180D–8051–06/05
Table 52. KBE Register
KBE - Keyboard Input Enable Register (9Dh)
Reset Value = 0000 0000b
76543210
KBE7 KBE6 KBE5 KBE4 KBE3 KBE2 KBE1 KBE0
Bit
Number
Bit
Mnemonic Description
7 KBE7
Keyboard Line 7 Enable Bit
Cleared to enable standard I/O pin.
Set to enable KBF. 7 bit in KBF register to generate an interrupt request.
6 KBE6
Keyboard Line 6 Enable Bit
Cleared to enable standard I/O pin.
Set to enable KBF. 6 bit in KBF register to generate an interrupt request.
5 KBE5
Keyboard Line 5 Enable Bit
Cleared to enable standard I/O pin.
Set to enable KBF. 5 bit in KBF register to generate an interrupt request.
4 KBE4
Keyboard Line 4 Enable Bit
Cleared to enable standard I/O pin.
Set to enable KBF. 4 bit in KBF register to generate an interrupt request.
3 KBE3
Keyboard Line 3 Enable Bit
Cleared to enable standard I/O pin.
Set to enable KBF. 3 bit in KBF register to generate an interrupt request.
2 KBE2
Keyboard Line 2 Enable Bit
Cleared to enable standard I/O pin.
Set to enable KBF. 2 bit in KBF register to generate an interrupt request.
1 KBE1
Keyboard Line 1 Enable Bit
Cleared to enable standard I/O pin.
Set to enable KBF. 1 bit in KBF register to generate an interrupt request.
0 KBE0
Keyboard Line 0 Enable Bit
Cleared to enable standard I/O pin.
Set to enable KBF. 0 bit in KBF register to generate an interrupt request.