AT80C51RD2 Atmel Corporation, AT80C51RD2 Datasheet - Page 54

• Manufacturer Part Number: AT80C51RD2
• Manufacturer: Atmel Corporation

Specifications of AT80C51RD2

• Max. Operating Frequency: 60 MHz
• Cpu: 8051-12C
• Max I/o Pins: 32
• Spi: 1
• Uart: 1
• Sram (kbytes): 1.25
• Operating Voltage (vcc): 2.7 to 5.5
• Timers: 4
• Watchdog: Yes

54
AT80C51RD2
Table 13-2.
KBE - Keyboard Input Enable Register (9Dh)
Reset Value = 0000 0000b
Number
KBE7
Bit
7
7
6
5
4
3
2
1
0
KBE Register
Mnemonic Description
KBE6
KBE7
KBE6
KBE5
KBE4
KBE3
KBE2
KBE1
KBE0
Bit
6
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.
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.
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.
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.
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.
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.
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.
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.
KBE5
5
KBE4
4
KBE3
3
KBE2
2
KBE1
1
4113D–8051–01/09
KBE0
0