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參數(shù)資料
| 型號： | MTA41300/SO |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | SPECIALTY MICROPROCESSOR CIRCUIT, PDSO18 |
| 封裝： | 0.300 INCH, PLASTIC, SOIC-18 |
| 文件頁數(shù)： | 28/28頁 |
| 文件大?。?/td> | 466K |
| 代理商： | MTA41300/SO |
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1995 Microchip Technology Inc.
DS40101C-page 9
MTA41300
5.0
PUSH-BUTTON INPUTS
The MTA41300 push-button inputs are defined to be
active when the input pin is in the low state. The
appropriate message data bit will be set equal to one
when a low is sampled at a switch input. When a switch
input is sampled in the high state the appropriate
message data bit will be set equal to zero.
6.0
TRACKBALL OPTION
The MTA41300 can also function as a trackball
controller. A trackball drag lock switch can be
connected to the DBTN input and an LED indicator
connected to the DLED output to aid in one-handed
trackball operation.
When using a mouse, a select and drag operation is
accomplished by clicking on an object and holding the
primary mouse button down. Moving the mouse then
drags the object to the desired location. When the
primary button is released, the object is placed at the
desired location. However, when the same select and
drag operation is performed using a trackball it may be
difficult to hold the button depressed and guide the
trackball with the same hand.
The MTA41300’s “drag lock” feature allows this
function to be accomplished with one hand. The drag
lock is set to the “l(fā)ocked” state by momentarily applying
a low to the DBTN input. This “l(fā)ocked” state is
equivalent to depressing and holding the primary
button when using a mouse. The user then guides the
object to the desired location without having to hold a
button depressed and simultaneously guide the
trackball. The object is placed and the “l(fā)ock” is released
when a low (e.g., button depressed) is momentarily
applied to any button input.
The DLED output is latched in the low state (0V) when
the DBTN input is sampled low (Figure 6-1). The DLED
output will remain low (“l(fā)ocked”) until the DBTN input is
sampled high and then sampled low again. Exiting the
locked state also occurs if either the PBTN or SBTN
inputs are sampled low when the DLED output is low.
When the DLED output is in low “l(fā)ocked” state, the
Primary Button depressed bit in the status message is
set high.
FIGURE 6-1:
TRACKBALL DRAG LOCK OPERATION
DBTN
DLED
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