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UR5HCFJL Datasheet (HTML) - Semtech Corporation

Part No. UR5HCFJL
Description  Zero-PowerTM Keyboard Encoder for Portable Systems
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Maker  SEMTECH [Semtech Corporation]
Homepage  http://www.semtech.com
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 6 page
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PC COMMUNICATION
Copyright Semtech, 1997-2001
DOC5-FJL-DS-106
www.semtech.com
6
The UR5HCFJL 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
UR5HCFJL 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 hex.
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 will also be directed to the
external keyboard. Presence or
absence of an external device will
not effect the normal operation of
the GreenCoderTM.



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