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AN2687 Datasheet(PDF) 12 Page - STMicroelectronics

No. de Pieza. AN2687
Descripción  STM8S20xxx LCD software driver
Descarga  22 Pages
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Fabricante  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
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AN2687 Datasheet(HTML) 12 Page - STMicroelectronics

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Example of a quadruplex LCD driver with STM8
AN2687
12/22
Doc ID 14296 Rev 1
Figure 5.
Hardware connection diagram
3.1
First method: Timer 2
In this method, the LCD timing is generated by the Timer 2 edge alignment mode using 2
interrupts: a compare one (value loaded into the TIM2_CCR1 register) and an overflow one
(value loaded into the TIM2_ARR register).
Each LCD display cycle consists of 4 phases, one for each backplane. Each COM line
generates its waveform during the corresponding phase e.g. COM1 line during phase1,
COM2 line during phase 2, etc.
When they are not generating their waveforms the COM lines remains at level VDD/2. Each
phase consists of two parts:
1.
active time
2.
dead time
During the active time, the segment lines and COM lines are used to drive the LCD. During
the dead time, the segment and COM lines are used to tune the contrast.
The active time starts after the Compare interrupt and, the dead time starts after the
Overflow interrupt. A total of 16 interrupts is generated in each frame period with 4 interrupts
per control period. There are 2 Compare events (CCR1_1 and CCR1_2 managed in the
VDD
470 k
Ω
470 k
Ω
Network resistors
Common lines
LCD Glass
Segment lines
PC4-PC7
ai14904
8
8
8
8
PB0-PB1
PD0-PD1
PE0-PE1
PG0-PG1
STM8
VDD
PE1
PE2
10 k
Ω


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