Rainbow-electronics AT89C5122 Bedienungsanleitung PDF herunterladen (Seite 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)

76543210

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.

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