XE88LC02 Datasheet, PDF (146/184 Pages) List of Unclassifed Manufacturers – Sensing Machine Data Acquisition MCU with 16 + 10 bit ZoomingADC and LCD driver

Datasheet XE88LC02 Sensing
Machine Data Acquisition MCU
with Zooming ADC and LCD driver
V3
pad_lcd_com0
V2
V0
V3
pad_lcd_com1
V2
V0
V3
pad_lcd_io[0]
V2
V0
V3
pad_lcd_io[1]
V2
V0
pad_lcd_com0 - pad_lcd_io[0] (on)
V3
V2
V0
-V2
-V3
pad_lcd_com1 - pad_lcd_io[1] (off)
V3
V2
V0
-V2
-V3
Figure 19-5. 1:2 MUX mode waveforms
The LCD driver is set to 1:2 multiplexing (LcdMux=01 in RegLcdOn) and the waveform generator is
enabled (LcdSleep=0 in RegLcdOn). All pads are set into the LCD driver mode by setting all bits of
register RegLcdSe to 1. To select a frame rate of about 50Hz, set the bits LcdFreq=01 and
LcdDivFreq=100 in RegLcdClkFrame. Note that the precision of the frame frequency depends on the
selected clock source (see clock block documentation).
The 64 segments are on or off depending on the bits set in the registers RegLcdDataN. Only the bits
0,1 and 4,5 of these registers are used in 1:2 multiplexing. Figure 19-5 shows the generated
waveforms for four segments. Segments connected to pad_lcd_io[0] are on (LcdData0[1:0]=11 in
RegLcdData0) and segments connected to pad_lcd_io[1] are off (LcdData0[5:4]=00 in
RegLcdData0). The figure shows on the left side the waveforms on the circuit pins, in the middle the
segment status and on the right the voltage on the segment (difference between the segment pin
pad_lcd_io and common signal pad_lcd_com0 or pad_lcd_com1).
19-10
D0207-134