参数资料
型号: C505L
厂商: SIEMENS AG
英文描述: Microcontrollers(8位微控制器)
中文描述: 微控制器(8位微控制器)
文件页数: 9/25页
文件大小: 113K
代理商: C505L
LCD Control
Using the C505L
9 of 25
AP0829 05.99
The timing of the row signals in Figure 5 is also programmable. The LCD controller has a
dedicated timer unit which is used to provide the clock signal for the controller. The clock
frequency (f
LCD
) is programmable and can be up to 360 Hz. The LCD controller can also
be clocked by the on-board Real Time Clock unit (this allows the LCD to remain active
even during power-down mode).
Since the row signals vary according to Figure 5, a constant voltage on the column pins
would cause all of the segments of the LCD to become active. To stop the segments from
becoming active, the voltage shown in Figure 6 (solid line) is applied to each column
signal.
Figure 6:
Column Pin Voltage for LCD Segments to remain inactive
Figure 6 shows the column signal that should be applied to ensure that no LCD segment
is activated. The dotted lines in Figure 6 represent the row signals from Figure 5. As
U1
U2
U3
Cx/R0
Time
U1
U2
U3
Cx/R1
Time
U1
U2
U3
Cx/R2
Time
U1
U2
U3
Cx/R3
Time
1 LCD Frame
1/f
LCD
Row Voltage
Column Voltage
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