UR5HCFJ8-FB 查看數據表（PDF） - Semtech Corporation
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UR5HCFJ8-FB Datasheet PDF : 16 Pages
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FUNCTIONAL DESCRIPTION
The UR5HCFJ8 consists functionally
of six major sections (see Functional
Diagram, previous page). These
are the Keyboard Encoder, the
Mode Control Unit, the PC
Communication Channel, the Data
Buffer, the Interrupt Control and the
8042 Emulation Channel. All
sections communicate with each
other and operate concurrently.
KEYBOARD ENCODER
The controller continuously scans a
keyboard organized as an 8 row by
16 column matrix for a maximum of
128 keys. Smaller-size keyboards
are supported provided that all
unused row lines are pulled to Vcc.
The IC selects 1 of the 16 column
lines (C0-C15) every 512 mS and
then reads the row data lines (R0-
R7). A key closure is detected as a
0 in the corresponding position of
the matrix. A complete scan cycle
for the entire keyboard takes
approximately 9.2 mS. Each key
found pressed is debounced for a
period of 20 mS. Once the key is
verified, the corresponding key
code(s) are loaded into the transmit
buffer of the PC Communication
Channel.
PIN DEFINITIONS
Mnemonic
VCC
VSS
OSCI
OSCO
_RESET
EKC1
DIP PLCC
40 44
20 22
39 43
38 42
1
1
37 41
VX
VXA
RP
KC
KD
EKD
ECK
_IQR
R0-R5
R6
R7
C0-C7
C8-C15
CL
NL
SL
NC
3
4
3
6
7
8
9
7
8
10 11
9 10
2
2
29-34
5
36
12-19
28-21
32-37
6
39
13-17
19-21
31-24
11 12
4
5
35 38
18
23,40
QFP
38
17
37
36
41
35
43
2
4
3
6
5
42
27-32
1
34
8-15
26-23
21-18
7
44
33
16,22
39,40
Type
I
I
I
O
I
I
I
I
I/O
I/O
I/O
I/O
I
I
I
I
O
O
O
O
O
O
O
Name and Function
Power Supply: +5V
Ground
Oscillator input
Oscillator output
Reset: Apply 0V to provide orderly start-up
External Keyboard Clock 1: Connects
to external keyboard Clock Line and is used
to generate an interupt for every Clock Line
transition.
Tie to Vcc
Tie to Vcc
Reserved: Ties to Vcc
Keyboard Clock: Connects to PC
keyboard port clock line
Keyboard Data: Connects to
PC port data line
External Keyboard Data: Connects to
external keyboard Data Lne
External Keyboard Clock: Connects
to external keyboard Clock Line
Interrupt Line: Reserved for low-power
applications
Row Data Inputs
Column Select Outputs: Selects 1 of
16 columns
Caps Lock LED
Num Lock LED
Scroll Lock LED
No Connects: These pins are unused.
Note: An underscore before a pin mnemonic denotes an active low signal.
Switch Matrix Encoding
Each matrix location is programmed
to represent either a single key or a
key combination of the IBM 101/102
standard keyboard.
Scan Code Table Sets
The UR5HCFJ8 supports all three
scan code table sets. Scan Code
Sets 1 and 2 are the default sets for
AT/PS/2 systems. Scan Code Table
Set 3 allows the user to program
individual key attributes such as
Make/Break and Typematic or
Single-Touch Action. For more
information, refer to the IBM
Technical Reference Manuals.
Copyright Semtech, 1997-2001
3
DOC5-FJ8-DS-107
www.semtech.com
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