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PDF HT82K28 Data sheet ( Hoja de datos )
| Número de pieza | HT82K28 | |
| Descripción | Win98 Keyboard Encoder | |
| Fabricantes | Holtek Semiconductor Inc | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de HT82K28 (archivo pdf) en la parte inferior de esta página. Total 20 Páginas | ||
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HT82K28A
Win98 Keyboard Encoder
Features
· Designed for Windows 95/98/NT
· Supports 3 Windows 95 Keys
· Supports Power, Sleep and Wake-up Win-
dows 98 ACPI functions
· Supports Japanese, Korean and Portuguese
· Supports Japanese DOS/V 106-key
keyboard
· Supports code set 1, for PS/2 model
30 keyboard
General Description
The HT82K28A is a keyboard encoder espe-
cially designed for IBM PC/AT, IBM PS/2 and
all compatible machines.
The HT82K28A accepts keyboard inputs and
contains a 16-character first-in-first-out buffer
· Supports code set 2, for PC/AT, PS/2 model
50,60 keyboards
· Supports code set 3, for PS/2 model
80 keyboard
· RC oscillator
· Phantom key detection
· Minimal external components
· Pin-compatible with Holtek HT6547E-2
· 40-pin DIP/DICE form
in which data is stored. An inexpensive RC os-
cillator can be used for the system clock. The
device offers the advantage of simple imple-
mentation in high performance and low cost
keyboard applications.
Pin Assignment
O SC1
VSS
VDD
VSS
IO 0
IO 1
C2
C3
C4
C5
C6
C7
R 10
R 11
R 12
R0
R1
R2
R3
R4
1 40
2 39
3 38
4 37
5 36
6 35
7 34
8 33
9 32
10 31
11 30
12 29
13 28
14 27
15 26
16 25
17 24
18 23
19 22
20 21
H T82K 28A
4 0 D IP
C1
C0
D ATA
C LO C K
R 18
R 17
NC
R 16
CAP
NUM
SCRL
R9
R8
R 15
R 14
NC
R 13
R7
R6
R5
1 February 16, 2000
1 page  
Power-on
Two important activities take place when power
is first applied to the keyboard. The first is the
presence of an H/W signal POR (Power-On-Re-
set) that resets the keyboard processor. The sec-
ond activity is the running of the self test BAT
(Basic Assurance Test) routine.
P O R R eset
150m s~2s
300m s~500m s
4 5 0 m s ~ 2 .5 s e c
P o w e r o n s ta r t B A T s ta r te d B A T c o m p le te
PC-type/mode/code set
The following table describes the relationship
between different computer types, the working
mode and the code sets.
PS/2 30
mode 1
code set 1
PC-AT
mode 2
code set 2
PS/2 50
mode 2
code set 2
PS/2 60
mode 2
code set 2
PS/2 80
mode 3
code set 3
The mode can be changed between mode 2 & 3.
Keys
· For code set 1, 2
All keys except the PAUSE key have a make
and break code. The PAUSE key has a make
code only.
The defaults except for PAUSE are make/
break/typematic. In mode 1, 2 and 3 the key
type may be changed to be one of the follow-
ing:
m ode1
m ode2
m ode3
¨ Typematic
¨ Make/break
¨ Make
¨ Typematic/make/break
HT82K28A
All keys except PAUSE are typematic.
Typematic means that the KB keeps send-
ing make codes if the key is held down.
The data report is according to the
typematic rate/delay:
Default values are: delay 500ms ± 20%
10.9 char/sec ± 20%
The typematic rate and delay can be modi-
fied with the F3 command.
¨ If two or more keys are held down, only the
last key pressed repeats at the typematic
rate.
Typematic operation stops when the last
key pressed is released even if other keys
are still held down.
If a key is pressed and held down while key-
board transmission is inhibited, only the
first make code is stored in the buffer over-
flow as a result of typematic action.
Four key types are supported as shown:
Key type press hold release
Typematic
Make/break
Make
Typematic/
make/break
make1
make1
make1
make1
make2
X
X
make2
X
break
X
break
Note: "make1" send out only one make
code.
"Make2" continue sending out make
codes until key is released.
"X" nothing sent out.
· For code set 3
¨ Typematic
¨ Make/break
¨ Make
¨ Typematic/make/break
Can be configured by command
Time interval between phantoms
The time interval between two continuous error
codes 00/FF sent while phantom detected=
1000ms ± 20%
5 February 16, 2000
5 Page 
HT82K28A
Key code set 1
Key Number
Base Case
Shift+Num
Left-Shift
Right-Shift
75
76
79
80
81
83
84
85
86
89
L Win
R Win
APP
E0 52
/E0 D2
E0 53
/E0 D3
E0 4B
/E0 CB
E0 47
/E0 C7
E0 4F
/E0 CF
E0 48
/E0 C8
E0 50
/E0 D0
E0 49
/E0 C9
E0 51
/E0 D1
E0 4D
/E0 CD
E0 5B
/E0 DB
E0 5C
/E0 DC
E0 5D
/E0 DD
E0 AA E0 52
/E0 D2 E0 2A
E0 AA E0 53
/E0 D3 E0 2A
E0 AA E0 4B
/E0 CB E0 2A
E0 AA E0 47
/E0 C7 E0 2A
E0 AA E0 4F
/E0 CF E0 2A
E0 AA E0 48
/E0 C8 E0 2A
E0 AA E0 50
/E0 D0 E0 2A
E0 AA E0 49
/E0 C9 E0 2A
E0 AA E0 51
/E0 D1 E0 2A
E0 AA E0 4D
/E0 CD E0 2A
E0 AA E0 5B
/E0 DB E0 2A
E0 AA E0 5C
/E0 DC E0 2A
E0 AA E0 5D
/E0 DD E0 2A
E0 B6 E0 52
/E0 D2 E0 36
E0 B6 E0 53
/E0 D3 E0 36
E0 B6 E0 4B
/E0 CB E0 36
E0 B6 E0 47
/E0 C7 E0 36
E0 B6 E0 4F
/E0 CF E0 36
E0 B6 E0 48
/E0 C8 E0 36
E0 B6 E0 50
/E0 D0 E0 36
E0 B6 E0 49
/E0 C9 E0 36
E0 B6 E0 51
/E0 D1 E0 36
E0 B6 E0 4D
/E0 CD E0 36
E0 B6 E0 5B
/E0 DB E0 36
E0 B6 E0 5C
/E0 DC E0 36
E0 B6 E0 5D
/E0 DD E0 36
When both shift keys are held down: Both Shift
key number 75
E0 AA E0 B6 E0 52/E0 D2 E0 2A E0 36
Num Lock
E0 2A E0 52
/E0 D2 E0 AA
E0 2A E0 53
/E0 D3 E0 AA
E0 2A E0 4B
/E0 CB E0 AA
E0 2A E0 47
/E0 C7 E0 AA
E0 2A E0 4F
E0 CF E0 AA
E0 2A E0 48
E0 C8 E0 AA
E0 2A E0 50
/E0 D0 E0 AA
E0 2A E0 49
/E0 C9 E0 AA
E0 2A E0 51
E0 D1 E0 AA
E0 2A E0 4D
E0 CD E0 AA
E0 2A E0 5B
/E0 DB E0 AA
E0 2A E0 5C
/E0 DC E0 AA
E0 2A E0 5D
/E0 DD E0 AA
Key Number
95
Base
E0 35
/E0 B5
when both shift keys are held down:
key number 95
+Left-Shift
E0 AA E0 35
/E0 B5 E0 2A
Both Shift
E0 AA E0 B6 E0 35
/E0 B5 E0 2A E0 36
+Right-Shift
E0 B6 E0 35
/E0 B5 E0 36
Key Number
124
Base
E0 2A E0 37
/E0 B7 E0 AA
+Left-Shift
E0 37
/E0 B7
+Right-Shift
54/D4
Key Number
Base
+Ctrl
126 E1 1D 45 E1 9D C5
E0 46 E0 C6
This key is not typematic, all associated scan codes occur on the make code.
ACPI Key
Power
Sleep
Wake
Make
E0 5E
E0 5F
E0 63
Break
E0 DE
E0 DF
E0 E3
Windows Virtual Key
N/A
N/A
N/A
11 February 16, 2000
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet HT82K28.PDF ] | |
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