at85c51snd3 ATMEL Corporation, at85c51snd3 Datasheet - Page 241

• Manufacturer Part Number: at85c51snd3
• Description: At85c51snd3 Single-chip Digital Audio Decoder - Encoder With Usb 2.0 Interface
• Manufacturer: ATMEL Corporation

Registers
7632D–MP3–01/07
Table 261. KBCON Register
KBCON (0.A3h) – Keyboard Control Register
Reset Value = 0000 1111b
Table 262. KBSTA Register
KBSTA (0.A4h) – Keyboard Control and Status Register
Reset Value = 0010 0000b
Number
Number
KINL3
KPDE
7-4
3-0
3-0
Bit
Bit
7
7
7
6
5
4
Mnemonic Description
Mnemonic Description
KINM3:0
KINL3:0
KINF3:0
KDCPE
KDCPE
KDCPL
KINL2
KPDE
Bit
Bit
6
6
-
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.
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.
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.
Keyboard DCPWR Pin Enable
Set to connect DCPWR pin on KIN0 input.
Clear to isolate DCPWR pin from KIN0 input.
Keyboard DCPWR Pin Line
Set by hardware and represent the level on DCPWR input.
Reserved
The value read from this bit is always 0. Do not set this bit.
Keyboard Input Interrupt Flag
Set by hardware when the respective KIN3:0 input detects a programmed level.
Cleared when reading KBSTA.
KDCPL
KINL1
5
5
KINL0
4
4
-
KINM3
KINF3
3
3
KINM2
KINF2
2
2
KINM1
KINF1
1
1
KINM0
KINF0
0
0
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