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ST72589BW Datasheet(PDF) 43 Page - STMicroelectronics

Part # ST72589BW
Description  8-BIT MCU WITH NESTED INTERRUPTS, DOT MATRIX LCD, ADC, TIMERS, PWM-BRM, SPI, SCI, I²C, CAN INTERFACES
PDF  158 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72589BW Datasheet(HTML) 43 Page - STMicroelectronics

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LCD DRIVER (Cont’d)
7.1.3 Segment and Common Output signals
Each dot of the LCD dot matrix panel is turned on
when the differential voltage between the segment
signal and the common signal increases over a
certain threshold, it is turned off when the voltage
is below the threshold voltage. The common sig-
nals determine the select timing within a frame cy-
cle (see Figure 27). The common signals have
similar waveforms to the segments, but different
phases.
Figure 27. Waveforms on LCD Outputs
Each common signal shows a high signal ampli-
tude (VLCD-VSS) only at the corresponding sec-
tion of a frame time. At the other sections of the
frame, the signal amplitude is low (3/4VLCD-1/
4VLCD). A dot can be turned-on only at phases
with high signal amplitude.
In 1/8 duty cycle mode, one frame is divided into 8
sections, and each section is divided into two
phases, phase 0 and 1. In 1/4 duty cycle mode,
the number of sections is reduced to 4. This
means the waveform pattern repeats faster in 1/4
duty cycle mode than 1/8 mode and the average
voltage and the ON/OFF duty cycle on a selected
pin is higher than in 1/8 mode. This results in a bet-
ter contrast of the display.
Note: The LCD must be disabled before entering
HALT mode or ACTIVE HALT mode.
Figure 28. LCD outputs with 1/8 Multiplex
VLCD
3/4
1/2
1/4
GND
01 01
Common selected
VLCD
3/4
1/2
1/4
GND
010 1
Common off
VLCD
3/4
1/2
1/4
GND
0 101
Segment selected
VLCD
3/4
1/2
1/4
GND
01 01
Segment off
VLCD
3/4
1/2
1/4
GND
COM8
VLCD
3/4
1/2
1/4
GND
COM7
VLCD
3/4
1/2
1/4
GND
SEG1
VLCD
3/4
1/2
1/4
GND
SEG2
8
76
5
2
1
8
ONE FRAME PERIOD
COM8
COM7
COM6
COM5
COM4
COM3
COM2
COM1
0 101 0101
01 0101



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