w83l950d Winbond Electronics Corp America, w83l950d Datasheet - Page 33

• Manufacturer Part Number: w83l950d
• Description: Peripheral Personal Computer Keyboard Controller
• Manufacturer: Winbond Electronics Corp America

GP3
GP3
GP3
GP3
GP3
GP3
GP3
GP3
7
6
5
4
0
3
1
2
output
output
output
output
output
output
output
output
Port control register 1
Bit 4=”1”
*
*
*
*
*
*
*
*
Port control register 1
Bit 5=”1”
**
**
**
**
**
**
**
**
Port GP32
latch
Port GP31
latch
Port GP30
latch
Port GP34
latch
Port GP37
latch
Port GP35
latch
Port GP33
latch
Port GP36
latch
Port GP3
Port GP3
Port GP3
Port GP3
Port GP3
Port GP3
Port GP3
Port GP3
Fig.8.1 Connection Example
register=”1”
register=”1”
register=”1”
register=”1”
register=”0”
register=”0”
register=”0”
register=”0”
7
6
5
4
3
2
1
0
Direction
Direction
Direction
Direction
Direction
Direction
Direction
Direction
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W83L950D
Key Input Interrupt request
* P-channel transistor for pull-up
** CMOS output buffer
Port P3
Input reading circuit
Comparator circuit