Rainbow Electronics AT89C5122 - Manual (Page 156)

156
AT8xC5122/23
4202E–SCR–06/06
Power Reduction Mode P5 inputs allow exit from idle and power-down modes as detailed in Section "Power-
Down Mode".
Registers
Reset Value = 0000 0000b
Table 94. Keyboard Flag Register - KBF (9Eh)
7 6 5 4 3 2 1 0
KBF7 KBF6 KBF5 KBF4 KBF3 KBF2 KBF1 KBF0
Bit
Number
Bit
Mnemonic Description
7 KBF7
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.
6 KBF6
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.
5 KBF5
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.
4 KBF4
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.
3 KBF3
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.
2 KBF2
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.
1 KBF1
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.
0 KBF0
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.