AT89C51ID2_05 Datasheet, PDF (78/157 Pages) ATMEL Corporation – 8-bit Flash Microcontroller

AT89C51ID2
Table 60. KBE Register
KBE-Keyboard Input Enable Register (9Dh)
7
KBE7
6
KBE6
5
KBE5
4
KBE4
3
KBE3
2
KBE2
1
KBE1
0
KBE0
Bit
Bit
Number Mnemonic Description
Keyboard line 7 Enable bit
7
KBE7 Cleared to enable standard I/O pin.
Set to enable KBF. 7 bit in KBF register to generate an interrupt request.
Keyboard line 6 Enable bit
6
KBE6 Cleared to enable standard I/O pin.
Set to enable KBF. 6 bit in KBF register to generate an interrupt request.
Keyboard line 5 Enable bit
5
KBE5 Cleared to enable standard I/O pin.
Set to enable KBF. 5 bit in KBF register to generate an interrupt request.
Keyboard line 4 Enable bit
4
KBE4 Cleared to enable standard I/O pin.
Set to enable KBF. 4 bit in KBF register to generate an interrupt request.
Keyboard line 3 Enable bit
3
KBE3 Cleared to enable standard I/O pin.
Set to enable KBF. 3 bit in KBF register to generate an interrupt request.
Keyboard line 2 Enable bit
2
KBE2 Cleared to enable standard I/O pin.
Set to enable KBF. 2 bit in KBF register to generate an interrupt request.
Keyboard line 1 Enable bit
1
KBE1 Cleared to enable standard I/O pin.
Set to enable KBF. 1 bit in KBF register to generate an interrupt request.
Keyboard line 0 Enable bit
0
KBE0 Cleared to enable standard I/O pin.
Set to enable KBF. 0 bit in KBF register to generate an interrupt request.
Reset Value= 0000 0000b
78
4289C–8051–11/05