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STFPC320 数据表(PDF) 72 Page - STMicroelectronics |
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STFPC320 数据表(HTML) 72 Page - STMicroelectronics |
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72 / 78 page  Electrical characteristics STFPC320 72/78 17.7 Timing characteristics VDD = 3.3 V, TA = -20 to 70°C, unless otherwise noted. Typical values are at TA = 25°C Figure 55. Key scanning and display timing Note: Pulse width of segment signal is decided by oscillator frequency. The value can be modified by trimming ROSC. One cycle of key scanning consists of one frame and data of 12 x 2 matrices are stored in RAM. The keyscan is only at the end of the frame when the display is ON. When the display is OFF, the key scan takes place continuously. The grid is turned off during the key scan. DIG1 DIG2 DIG3 DIGn SEG Output G1 G2 G3 Gn Key scan data DIG1 1 frame = t DISP x (n+1) 1/16 t DISP t DISP ≈ 500μs (1) |
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