AT89C51ED2-RDTIM datasheet(61/137 Pages) ATMEL

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AT89C51RD2/ED2

4235E–8051–04/04

Registers

Table 43. KBF Register

KBF-Keyboard Flag Register (9Eh)

Reset Value = 0000 0000b

This register is read only access, all flags are automatically cleared by reading the

KBF7

KBF6

KBF5

KBF4

KBF3

KBF2

KBF1

KBF0

Bit

Number

Bit

Mnemonic

Description

7KBF7

Keyboard line 7 flag

Set by hardware when the Port line 7 detects a programmed level. It generates a

Keyboard interrupt request if the KBKBIE.7 bit in KBIE register is set.

Must be cleared by software.

6KBF6

Keyboard line 6 flag

Set by hardware when the Port line 6 detects a programmed level. It generates a

Keyboard interrupt request if the KBIE.6 bit in KBIE register is set.

Must be cleared by software.

5KBF5

Keyboard line 5 flag

Set by hardware when the Port line 5 detects a programmed level. It generates a

Keyboard interrupt request if the KBIE.5 bit in KBIE register is set.

Must be cleared by software.

4KBF4

Keyboard line 4 flag

Set by hardware when the Port line 4 detects a programmed level. It generates a

Keyboard interrupt request if the KBIE.4 bit in KBIE register is set.

Must be cleared by software.

3KBF3

Keyboard line 3 flag

Set by hardware when the Port line 3 detects a programmed level. It generates a

Keyboard interrupt request if the KBIE.3 bit in KBIE register is set.

Must be cleared by software.

2KBF2

Keyboard line 2 flag

Set by hardware when the Port line 2 detects a programmed level. It generates a

Keyboard interrupt request if the KBIE.2 bit in KBIE register is set.

Must be cleared by software.

1KBF1

Keyboard line 1 flag

Set by hardware when the Port line 1 detects a programmed level. It generates a

Keyboard interrupt request if the KBIE.1 bit in KBIE register is set.

Must be cleared by software.

0KBF0

Keyboard line 0 flag

Set by hardware when the Port line 0 detects a programmed level. It generates a

Keyboard interrupt request if the KBIE.0 bit in KBIE register is set.

Must be cleared by software.

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