at83c5122 ATMEL Corporation, at83c5122 Datasheet - Page 156

• Manufacturer Part Number: at83c5122
• Description: At83c5123 C51 Microcontroller With Usb And Smart Card Reader Interfaces
• Manufacturer: ATMEL Corporation

Power Reduction Mode
Registers
156
AT8xC5122/23
P5 inputs allow exit from idle and power-down modes as detailed in Section "Power-
Down Mode".
Table 94. Keyboard Flag Register - KBF (9Eh)
Reset Value = 0000 0000b
Number
KBF7
Bit
7
6
5
4
3
2
1
0
7
Mnemonic Description
KBF7
KBF6
KBF5
KBF4
KBF3
KBF2
KBF1
KBF0
KBF6
Bit
6
Keyboard line 7 flag
Set by hardware when the Port line 7 detects a programmed level. It generates a
Keyboard interrupt request if the KBE.7 bit in KBE register is set.
Cleared by hardware after the read of the KBF register.
Keyboard line 6 flag
Set by hardware when the Port line 6 detects a programmed level. It generates a
Keyboard interrupt request if the KBE.6 bit in KBE register is set.
Cleared by hardware after the read of the KBF register.
Keyboard line 5 flag
Set by hardware when the Port line 5 detects a programmed level. It generates a
Keyboard interrupt request if the KBE.5 bit in KBE register is set.
Cleared by hardware after the read of the KBF register.
Keyboard line 4 flag
Set by hardware when the Port line 4 detects a programmed level. It generates a
Keyboard interrupt request if the KBE.4 bit in KBE register is set.
Cleared by hardware after the read of the KBF register.
Keyboard line 3 flag
Set by hardware when the Port line 3 detects a programmed level. It generates a
Keyboard interrupt request if the KBE.3 bit in KBE register is set.
Cleared by hardware after the read of the KBF register.
Keyboard line 2 flag
Set by hardware when the Port line 2 detects a programmed level. It generates a
Keyboard interrupt request if the KBE.2 bit in KBE register is set.
Cleared by hardware after the read of the KBF register.
Keyboard line 1 flag
Set by hardware when the Port line 1 detects a programmed level. It generates a
Keyboard interrupt request if the KBE.1 bit in KBE register is set.
Cleared by hardware after the read of the KBF register.
Keyboard line 0 flag
Set by hardware when the Port line 0 detects a programmed level. It generates a
Keyboard interrupt request if the KBE.0 bit in KBE register is set.
Cleared by hardware after the read of the KBF register.
KBF5
5
KBF4
4
KBF3
3
KBF2
2
KBF1
1
4202E–SCR–06/06
KBF0
0