AT83C5136-RDTUL datasheet(72/171 Pages) ATMEL

72 / 171 page

AT83C5134/35/36

7683B–USB–03/07

Power Reduction Mode

P1 inputs allow exit from idle and power down modes as detailed in section “Power-

down Mode”.

Registers

Table 60. KBF Register

KBF - Keyboard Flag Register (9Eh)

Reset Value = 0000 0000b

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.

Cleared by hardware when reading KBF SFR 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.

Cleared by hardware when reading KBF SFR 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.

Cleared by hardware when reading KBF SFR 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.

Cleared by hardware when reading KBF SFR 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.

Cleared by hardware when reading KBF SFR 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.

Cleared by hardware when reading KBF SFR 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.

Cleared by hardware when reading KBF SFR by software.

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