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AN2687 Datasheet(PDF) 1 Page - STMicroelectronics |
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AN2687 Datasheet(HTML) 1 Page - STMicroelectronics |
1 / 22 page April 2009 Doc ID 14296 Rev 1 1/22 AN2687 Application note STM8S20xxx LCD software driver Introduction This application note describes two different methods for driving liquid crystal displays (LCD) with any standard STM8S20xxx microcontroller (MCU), without any specific on-chip LCD driver hardware: ● the first method uses the timer 2 channel resource and also allows LCD contrast control through software ● the second method uses the Auto-wakeup mode only This application note starts with an introduction on LCDs in Section 1: LCD principle and Section 2: LCD drive signals. Section 3 then presents a solution based on a standard STM8S20xxx MCU directly driving a quadruplex LCD. This solution can be implemented with any MCU as it only requires the standard I/O ports and some timings. Section 4 gives consumption considerations. Section 5 describes how to control contrast through software: for this purpose, two push-buttons connected to two standard I/Os are used. Finally, Section 6 gives an overview of the LCD demo board based on an STM8S20xxx microcontroller, and provides the board schematics. For more information on the LCD drive theory, please refer also to AN1048. The number of external components is kept to a minimum of two external resistors per COM line. The number of I/Os depends on the number of LCD segments used. Software contrast control is a very flexible solution that can be easily adapted to a wide range of applications. |
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