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参数资料
| 型号： | MTA41110/P |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | SPECIALTY MICROPROCESSOR CIRCUIT, PDIP18 |
| 封装： | 0.300 INCH, PLASTIC, DIP-18 |
| 文件页数： | 22/24页 |
| 文件大小： | 377K |
| 代理商： | MTA41110/P |
1995 Microchip Technology Inc.
DS40103C-page 7
MTA41110
4.0
PUSH-BUTTON INPUTS
The MTA41110 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 mes-
sage data bit will be set equal to zero.
5.0
TRACKBALL OPTION
The MTA41110 can also function as a trackball control-
ler. 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
performed by clicking on an object and holding the pri-
mary mouse button down.
Moving the mouse then
drags the object to the desired location. When the pri-
mary 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 MTA41110’s “drag lock” feature allows this func-
tion to be accomplished with one hand. The drag lock
is set to the “locked” state by momentarily applying a
low to the DBTN input. This “locked” state is equivalent
to depressing and holding the primary mouse button.
The user then guides the object to the desired location
without having to hold a button depressed and simulta-
neously guide the trackball. The object is placed and
the “lock” 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 5-1).
The
DLED output will remain low (“locked”) until the DBTN
input is sampled high and then sampled low again.
Exiting the locked state also occurs if the PBTN input
or SBTN input is sampled low when the DLED output is
low. When the DLED output is in low “locked” state, the
Primary Button depressed bit in the status message is
set high.
FIGURE 5-1:
TRACKBALL DRAG LOCK OPERATION
DBTN
DLED
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