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VT82C686B 参数 Datasheet PDF下载

VT82C686B图片预览
型号: VT82C686B
PDF下载: 下载PDF文件 查看货源
内容描述: PCI SUPER -I / O集成外设控制器 [PCI Super-I/O Integrated Peripheral Controller]
分类和应用: 控制器PC
文件页数/大小: 128 页 / 1074 K
品牌: ETC [ ETC ]
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VT82C686B  
Port 64 - Keyboard / Mouse Command.......................... WO  
This port is used to send commands to the keyboard / mouse  
controller.  
The command codes recognized by the  
VT82C686B are listed n the table below.  
Note: The VT82C686B Keyboard Controller is compatible  
with the VIA VT82C42 Industry-Standard Keyboard  
Controller except that due to its integrated nature, many of the  
input and output port pins are not available externally for use  
as general purpose I/O pins (even though P13-P16 are set on  
power-up as strapping options). In other words, many of the  
commands below are provided and work, but otherwise  
perform no useful function (e.g., commands that set P12-P17  
high or low). Also note that setting P10-11, P22-23, P26-27,  
and T0-1 high or low directly serves no useful purpose, since  
these bits are used to implement the keyboard and mouse ports  
and are directly controlled by keyboard controller logic.  
Table 4. Keyboard Controller Command Codes  
Code  
20h  
Keyboard Command Code Description  
Read Control Byte (next byte is Control Byte)  
Code  
C0h  
Keyboard Command Code Description  
Read input port (read P10-17 input data to  
21-3Fh Read SRAM Data (next byte is Data Byte)  
60h Write Control Byte (next byte is Control Byte)  
61-7Fh Write SRAM Data (next byte is Data Byte)  
the output buffer)  
C1h  
Poll input port low (read input data on P11-13  
repeatably & put in bits 5-7 of status  
Poll input port high (same except P15-17)  
C2h  
C8h  
9xh  
A1h  
A4h  
Write low nibble (bits 0-3) to P10-P13  
Output Keyboard Controller Version #  
Test if Password is installed  
Unblock P22-23 (use before D1 to change  
active mode)  
Reblock P22-23 (protection mechanism for D1)  
(always returns F1h to indicate not installed)  
Disable Mouse Interface  
Enable Mouse Interface  
Mouse Interface Test (puts test results in port 60h)  
(value: 0=OK, 1=clk stuck low, 2=clk stuck high,  
3=data stuck lo, 4=data stuck hi, FF=general error)  
KBC self test (returns 55h if OK, FCh if not)  
Keyboard Interface Test (see A9h Mouse Test)  
Disable Keyboard Interface  
C9h  
A7h  
A8h  
A9h  
CAh  
Read mode (output KBC mode info to port 60  
output buffer (bit-0=0 if ISA, 1 if PS/2)  
D0h  
D1h  
D2h  
D3h  
Read Output Port (copy P10-17 output port values  
to port 60)  
Write Output Port (data byte following is written to  
keyboard output port as if it came from keyboard)  
Write Keyboard Output Buffer & clear status bit-5  
(write following byte to keyboard)  
Write Mouse Output Buffer & set status bit-5 (write  
following byte to mouse; put value in mouse input  
buffer so it appears to have come from the mouse)  
Write Mouse (write following byte to mouse)  
AAh  
ABh  
ADh  
AEh  
AFh  
Enable Keyboard Interface  
Return Version #  
B0h  
B1h  
B2h  
B3h  
B4h  
B5h  
B6h  
B7h  
B8h  
B9h  
BAh  
BBh  
BCh  
BDh  
BEh  
BFh  
Set P10 low  
Set P11 low  
Set P12 low  
Set P13 low  
Set P22 low  
Set P23 low  
Set P14 low  
Set P15 low  
Set P10 high  
Set P11 high  
Set P12 high  
Set P13 high  
Set P22 high  
Set P23 high  
Set P14 high  
Set P15 high  
D4h  
E0h  
Exh  
Fxh  
Read test inputs (T0-1 read to bits 0-1 of resp byte)  
Set P23-P21 per command bits 3-1  
Pulse P23-P20 low for 6usec per command bits 3-0  
All other codes not listed are undefined.  
Revision 1.71 June 9, 2000  
-41-  
Register Descriptions - Legacy I/O Ports  
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