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參數(shù)資料
| 型號： | W83C45P |
| 英文描述： | Keyboard Controller |
| 中文描述： | 鍵盤控制器 |
| 文件頁數(shù)： | 8/15頁 |
| 文件大小： | 89K |
| 代理商： | W83C45P |
W83C42
- 8 -
ELECTRICAL CHARACTERISTICS & CAPACITANCE
(Ta = 0
°
C to +70
°
C, V
DD
= +5V
±
5%)
SYMBOL
DESCRIPTION
MIN.
TYP.
MAX.
UNIT
V
DD
Power Supply
4.75
5.0
5.25
V
T
A
Operating Temperature
0
25
70
V
V
IH
High Level Voltage for TTL
Min. I/P
2.0
V
DD
V
V
IL
Low Level Voltage for TTL
Max. I/P
-0.3
0.8
V
V
OH
High Level Voltage for TTL
Min. O/P
V
DD
-0.5
V
V
OL
Low Level Voltage for TTL
Max. O/P
0.5
V
R
IP
Min. I/P Resist
10K
μ
A
μ
A
mA
I
LI
I/P Leakage Current
-10
10
I
LO
O/P Leakage Current
-10
10
I
OL
O/P Sink Current
4
C
L
O/P Load Capacity
15
50
pF
STATUS REGISTER
The status register is an 8-bit read-only register at I/O address hex 64 that holds information about the
state of the keyboard controller and interface. It may be read at any time.
BIT
BIT DESCRIPTION
FUNCTION
0
Output Buffer Full
0: Output Buffer Empty
1: Output Buffer Full
1
Input Buffer Full
0: Input Buffer Empty
1: Input Buffer Full
2
System Flag
This bit may be set to 0 or 1 by writing to the system flag bit in
the command byte of the keyboard controller. It is set to 0 after
a power-on reset
3
Command/data
0: Data Byte
1: Command Byte
4
Inhibit Switch
0: Keyboard is Inhibited
1: Keyboard is Not Inhibited
5
Transmit Time Out
0: No Transmit Time Out Error
1: Transmit Time Out Error
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