AT89C51ID2-RDTIM datasheet(78/159 Pages) ATMEL

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AT89C51ID2

4289A–8051–09/03

Registers

Table 58. KBF Register

KBF-Keyboard Flag Register (9Eh)

Reset Value= 0000 0000b

7654

3210

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.

AT89C51ID2-RDTIM Datasheet(PDF) 78 Page - ATMEL Corporation

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