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LH1595 Datasheet(PDF) 10 Page - Sharp Corporation |
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LH1595 Datasheet(HTML) 10 Page - Sharp Corporation |
10 / 48 page 10 LH1594/LH1595 2. FUNCTIONAL DESCRIPTION 2.1. MPU Interface 2.1.1. INTERFACE TYPE SELECTION The LH1594/LH1595 transfer data through 8-bit parallel I/O (D7 to D0) or serial data input (SDA, SCL). The selection between parallel interface and serial interface is made by setting the state of P/S pin to "H" or "L". P/S I/F TYPE CSB RS RDB WRB M86 SDA SCL DATA BUS H Parallel CSB RS RDB WRB M86 – – D7 to D0 L Serial – (LH1594) CSB (LH1595) – (LH1594) RS (LH1595) – – – SDA SCL – 2.1.2. PARALLEL INPUT The LH1594/LH1595 can transfer data in parallel by directly connecting 8-bit MPU to the data bus when parallel interface is selected with P/S pin. As an 8-bit MPU, either 80-family MPU interface or 68-family MPU interface is selected with M86 pin. M86 MPU TYPE CSB RS RDB WRB DATA H 68-family MPU CSB RS E R/W D7 to D0 L 80-family MPU CSB RS RDB WRB D7 to D0 2.1.3. DATA IDENTIFICATION The LH1594/LH1595 can identify the data of 8-bit data bus by combinations of RS, RDB and WRB signals. RS 68-FAMILY R/W 80-FAMILY FUNCTION RDB WRB 0 1 0 1 Reads out busy flags 0 0 1 0 Writes to commands 1 0 1 0 Writes to data RAM 1 1 0 1 Reads from data RAM |
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