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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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UR5HC418-FN Datenblatt(PDF) 5 Page - Semtech Corporation |
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UR5HC418-FN Datenblatt(HTML) 5 Page - Semtech Corporation |
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5 / 14 page  8042 EMULATION CHANNEL PC COMMUNICATION Copyright ©1997-2001 Semtech Corporation DOC5-418-DS-109 www.semtech.com 5 The DeskCoderTM fully emulates a system’s keyboard port, available to a standard 84/85/101/102 external keyboard or other 8042-compatible device. Communication with a keyboard-compatible device is accomplished by clock and data lines via EKC and EKD pins, respectively. A third pin, EKC1 that connects to the clock line, interrupts the controller whenever the external device initiates a communication session. When power is first applied, the controller proceeds with the standard reset sequence with the external device. Data and commands initiated from the external device are buffered in the controller’s FIFO along with data from the scanned matrix, and then are presented to the system as if they were coming from a single source. Once they are acknowledged, commands and data from the system are then transmitted to the external device. The DeskCoderTM implements all the standard functions of communication with a BIOS- compatible PC/XT or AT/PS/2 host system. Two lines, KC and KD, provide bi-directional clock and data signals. In addition, the DeskCoderTM supports all commands from and to the system, as described in the IBM Technical Reference Manuals. The following table shows the commands that the system may send and their values in hexadecimal. Command Hex Value Set/Reset Status ED Indicators Echo EE Invalid Command EF Select Alternate F0 Scan Codes Invalid Command F1 Read ID F2 Set Typematic F3 Rate/Delay Enable F4 Default Disable F5 Set Default F6 Set All Keys Typematic F7 Make/Break F8 Make F9 Typematic/Make/Break FA Set Key Type Typematic FB Make/Break FC Make FD Resend FE Reset FF Table 2: Keyboard Commands from the System (AT / PS/2 protocol) These commands are supported in the AT / PS/2 protocol and can be sent to the keyboard at any time. The following table shows the commands that the keyboard may send to the system. Command Hex Value Key Detection 00* Error/Overrun Keyboard ID 83AB BAT Completion Code AA BAT Failure Code FC Echo EE Acknowledge (Ack) FA Resend FE Key Detection Error/Overrun FF** *Code Sets 2 and 3 **Code Set 1 Table 3: Keyboard Commands to the System (AT/PS/2 protocol) When an external keyboard is connected, commands from the system are also directed to the external keyboard. Presence or absence of an external device does not affect the normal operation of the UR5HC418. |
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