AT89C51ED2-RDTUM datasheet(60/137 Pages) ATMEL

60 / 137 page

4235K–8051–05/08

AT89C51RD2/ED2

15.1

Registers

Table 15-1.

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 register.

KBF7

KBF6

KBF5

KBF4

KBF3

KBF2

KBF1

KBF0

Bit Number

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.

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 KBIE.6 bit in KBIE register is set.

Must be cleared by software.

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 KBIE.5 bit in KBIE register is set.

Must be cleared by software.

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 KBIE.4 bit in KBIE register is set.

Must be cleared by software.

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 KBIE.3 bit in KBIE register is set.

Must be cleared by software.

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 KBIE.2 bit in KBIE register is set.

Must be cleared by software.

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 KBIE.1 bit in KBIE register is set.

Must be cleared by software.

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 KBIE.0 bit in KBIE register is set.

Must be cleared by software.

AT89C51ED2-RDTUM Datasheet(PDF) 60 Page - ATMEL Corporation

AT89C51ED2-RDTUM Datasheet(HTML) 60 Page - ATMEL Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL