vt82c42 ETC-unknow, vt82c42 Datasheet - Page 6

• Manufacturer Part Number: vt82c42
• Description: Vt82c42 Keyboard Controller
• Manufacturer: ETC-unknow

5. Design Example:
number.
B0h : write 0 to P10.
B1h : write 0 to P11.
B2h : write 0 to P12.
B3h : write 0 to P13.
B4h : write 0 to P22.
B5h : write 0 to P23.
B6h : write 0 to P14.
B7h : write 0 to P15.
B8h : write 1 to P10.
B9h : write 1 to P11.
BAh : write 1 to P12.
BBh : write 1 to P13.
BCh : write 1 to P22.
BDh : write 1 to P23.
BEh : write 1 to P14.
BFh : write 1 to P15.
C0h : read controller's
input ports P17-P10.
C1h : poll input port
low.
C2h : poll input port
high.
C8h : enable D1
command be effective
to P22 and P23.
C9h : disable D1
command be effective
to P22 and P23.
CAh : return on bit0 the
mode value.
D0h : return the
controller's output port
P20-P27.
D1h : write output port.
D2h : write keyboard
output buffer
D3h : write mouse
output buffer
D4h : write to mouse
E0h : read test inputs.
Exh : active output
ports
Fxh : pulse output ports
1. To work with AT mode mother board.
VIA Technologies, Inc.
Read from P11,P12,P13 and write to status register bit5,bit6,bit7.
Read from P15,P16,P17 and write to status register bit5,bit6,bit7.
1 for PS2 mode, 0 for AT mode.
The next byte written to data port will be put on output port.
The next byte written in to data port will be put on the output buffer
and OBF = 1.
The next byte written in to data port will be put on the output buffer
and mouse OBF = 1.
The next byte written in to data port will be transmit to mouse.
Return T0 & T1 values on bit0 & bit1 respectively.
P23-P21 will change according to the status on bit3-bit1.
P23-P20 will be pulse low for 6us according to the status on bit3-
bit0.
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VT82C42