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AN2687 Datasheet(PDF) 12 Page - STMicroelectronics |
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AN2687 Datasheet(HTML) 12 Page - STMicroelectronics |
12 / 22 page 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 |
Número de pieza similar - AN2687 |
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Descripción similar - AN2687 |
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