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参数资料
| 型号： | EKK6111 |
| 英文描述： | QFN Packaged, ±15kV ESD Protected, +3V to +5.5V, 300nA, 250kbps, RS-232 Transceivers with Enhanced Automatic Powerdown and a Separate Logic Supply; Temperature Range: -40°C to 85°C; Package: 32-QFN |
| 中文描述： | 的PS / 2键盘射频接收器 |
| 文件页数： | 14/17页 |
| 文件大小： | 1084K |
| 代理商： | EKK6111 |
eKK6111
RF KEYBOARD DECODER
Preliminary
Reset ( Hex FF )
-
Responds ACK.
-
Checks clock and data lines in the high state for at least 500 microseconds or receives another command.
-
Default to scan code set 2 .
Command to the system
The following are the keyboard output commands.
Acknowledge ( Hex FA )
The keyboard sends an acknowledge in response to any valid command from the system except for RESEND and
ECHO.
BAT Completion Code ( Hex AA )
This command is issued after successful completion of keyboard self test.
BAT Failure Code ( Hex FC )
If a BAT failure occurs, the keyboard sends this code , discontinues scanning, and waits for a system response or reset.
Echo ( Hex EE )
The keyboard sends this code in response to an ECHO command.
Keyboards ID ( Hex 83AB )
The 2 byte ID is issued to respond to READ ID command. The low byte is sent first, followed by the high byte.
Keyboard buffer Overrun ( Hex 00 or FF )
If keyboard buffer overflows, the overrun code will replace the last byte in the buffer. If the keyboard is using scan code
set 1 , the code is hex FF. For sets 2 and 3, the code is hex 00.
Resend ( Hex FE )
When the keyboard receives an invalid input or any input with incorrect parity, the RESEND command is sent.
Keyboard Scan Code Table
The keyboard contains 3 scan code sets. The system defaults to scan set 2. but can be switched to set 1 or set 3 .
The following tables show the key numbers and three scan code sets in hexadecimal values. All the keys are typematics
except for the pause key. When a key is pressed down, the make scan code is sent to the system. When the key is
released, its break code is sent. If two or more keys are held down, only the last key pressed repeats at the typematic
* This specification are subject to be changed without notice.
6
2002/11/15
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