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AN2687 Datasheet(PDF) 14 Page - STMicroelectronics |
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AN2687 Datasheet(HTML) 14 Page - STMicroelectronics |
14 / 22 page Consumption considerations AN2687 14/22 Doc ID 14296 Rev 1 4 Consumption considerations The number of code lines the MCU has to execute to drive the LCD is the same whatever the CPU frequency. It is then easy to understand that the faster the CPU clock, the faster these code lines are executed, the less they represent in terms of CPU load, and the less the MCU consumes. In order to reduce consumption with both methods, the PCKEN (peripheral clock gating) register of the Clock Controller is used in order to clock only the used peripherals. VDD can also be decreased, especially in the first method (as the contrast can be compensated for by software) to further reduce the consumption. The consumption values obtained with the first method (at 3.3 V) are given in Table 2. Note: These typical values are given for guidance only. The LCD driver consumption is obtained by subtracting the consumption of the MCU executing the LCD driver function and the consumption of the MCU executing an empty loop (with all I/Os configured as output low level). The consumption values obtained with the second method (at 3.3 V) are given in Table 3. Note: These typical values are given for guidance only. The LCD driver consumption is obtained by subtracting the consumption of the MCU executing the LCD driver function and the consumption of the MCU executing an empty loop (with the MCU in AWU mode with all its I/Os configured as output low level). Table 2. First method - consumption (Timer 2) Clock master Consumption of the MCU executing LCD driver (mA) Consumption of the LCD driver (mA) Consumption of the MCU executing an empty loop HSI 2.38 0.3 2.08 HSI/2 1.73 0.38 1.35 HSI/4 1.45 0.49 0.96 HSI/8 1.3 0.7 0.6 LSI 1.17 0.94 0.23 Table 3. Second method - consumption (AWU) Clock master Consumption of the MCU executing LCD driver (mA) Consumption of the LCD driver (mA) Consumption of the MCU executing an empty loop HSI 1.08 0.36 0.72 HSI/2 1.12 0.4 0.72 HSI/4 1.26 0.51 0.75 HSI/8 1.34 0.58 0.76 LSI 1.02 0.33 0.69 |
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