Rainbow-electronics AT89C51SND1C Manual de usuario descargar pdf (Pagina 180)

180

AT8xC51SND1C

4109E–8051–06/03

Registers Table 151. KBCON Register

KBCON (S:A3h) – Keyboard Control Register

Reset Value = 0000 1111b

Table 152. KBSTA Register

KBSTA (S:A4h) – Keyboard Control and Status Register

Reset Value = 0000 0000b

76543210

KINL3 KINL2 KINL1 KINL0 KINM3 KINM2 KINM1 KINM0

Bit

Number

Bit

Mnemonic Description

7 - 4 KINL3:0

Keyboard Input Level Bit

Set to enable a high level detection on the respective KIN3:0 input.

Clear to enable a low level detection on the respective KIN3:0 input.

3 - 0 KINM3:0

Keyboard Input Mask Bit

Set to prevent the respective KINF3:0 flag from generating a keyboard interrupt.

Clear to allow the respective KINF3:0 flag to generate a keyboard interrupt.

76543210

KPDE - - - KINF3 KINF2 KINF1 KINF0

Bit

Number

Bit

Mnemonic Description

7KPDE

Keyboard Power Down Enable Bit

Set to enable exit of power down mode by the keyboard interrupt.

Clear to disable exit of power down mode by the keyboard interrupt.

6 - 4 -

Reserved

The value read from these bits is always 0. Do not set these bits.

3 - 0 KINF3:0

Keyboard Input Interrupt Flag

Set by hardware when the respective KIN3:0 input detects a programmed level.

Cleared when reading KBSTA.

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Rainbow-electronics AT89C51SND1C Manual de usuario Pagina 180