AT89C51RC2-3CSCM View Datasheet(PDF) - Atmel Corporation

Part Name

Description

MFG CO.

AT89C51RC2-3CSCM

8-bit Microcontroller with 16K/32K Bytes Flash

Atmel Corporation 

Registers

AT89C51RB2/RC2

Table 51. KBF Register

KBF - Keyboard Flag Register (9Eh)

7

KBF7

6

KBF6

5

KBF5

4

KBF4

3

KBF3

2

KBF2

1

KBF1

0

KBF0

Bit

Number

7

Bit

Mnemonic Description

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 KBKBIE. 7 bit in KBIE register is set.

Must be cleared by software.

Keyboard Line 6 Flag

6

KBF6

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.

Keyboard Line 5 Flag

5

KBF5

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.

Keyboard Line 4 Flag

4

KBF4

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.

Keyboard Line 3 Flag

3

KBF3

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.

Keyboard Line 2 Flag

2

KBF2

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.

Keyboard Line 1 Flag

1

KBF1

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.

Keyboard Line 0 Flag

0

KBF0

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.

Reset Value = 0000 0000b

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

register.

65

4180E–8051–10/06

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