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LH1595 Datasheet(PDF) 11 Page - Sharp Corporation |
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LH1595 Datasheet(HTML) 11 Page - Sharp Corporation |
11 / 48 page LH1594/LH1595 11 2.1.4. SERIAL INTERFACE [FOR LH1594] The serial interface for the LH1594 is I2C BUS format. I2C BUS is for bi-directional two-line communication between different ICs or other modules. LH1594 always operates as a slave device, so sending data of start and stop is controlled by start/stop bits which are sent by master device. [FOR LH1595] The serial interface of LH1595 can accept inputs of SDA and SCL in the chip selection state (CSB = "L"). When not in the chip selection state, the internal shift register and counter are reset to their initial condition. Serial data SDA are input sequentially in order of D7 to D0 at the rising edge of serial clock (SCL) and are converted into 8-bit parallel data (by serial to parallel conversion) at the rising edge of the 8th serial clock, being processed in accordance with the data. The identification whether the serial data inputs (SDA) are display data or commands is judged by input to RS pin. RS = "H" : Display data RS = "L" : Commands After completing 8-bit data transferring, or when making no access, be sure to set serial clock input (SCL) to "L". Protection of SDA and SCL signals against external noise should be taken in actual wiring. To prevent the successive recognition errors of transferring data from external noise, release the chip selection state (CSB = "H") at every completion of 8-bit data transferring. Valid D0 RS SCL SDA CSB D1 D2 D3 D4 D5 D6 D7 8 7 6 5 4 3 2 1 |
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