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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST7920 датащи(PDF) 21 Page - Sitronix Technology Co., Ltd. |
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ST7920 датащи(HTML) 21 Page - Sitronix Technology Co., Ltd. |
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21 / 49 page  ST7920 V4.0 21/49 2008/08/18 l Function Set DL: 4/8-bit interface control bit When DL = "1", 8-bit MPU bus interface When DL = "0", 4-bit MPU bus interface RE: extended instruction set control bit When RE = "1", extended instruction set When RE = "0", basic instruction set In same instruction cannot alter DL and RE at once. Make sure that change DL first then RE. l Set CGRAM Address Set CGRAM address into address counter (AC) AC range is 00H …3FH Make sure that in extended instruction SR=0 (scroll address or RAM address select) l Set DDRAM Address Set DDRAM address into address counter (AC). First line AC range is 80H …8FH Second line AC range is 90H …9FH Third line AC range is A0H …AFH Fourth line AC range is B0H …BFH Please note that only 2 lines can be display with one ST7920. l Read Busy Flag (BF) and Address Read busy flag (BF) can check whether the internal operation is finished or not. At the same time, the value of address counter (AC) is also read. When BF = “1”, further instruction(s) will not be accepted until BF = “0”. 0 0 0 0 1 DL X RE Code RS RW DB7 DB6 DB5 DB4 DB1 DB2 DB3 X X DB0 0 1 BF AC6 AC5 AC4 AC3 AC2 Code RS RW DB7 DB6 DB5 DB4 DB1 DB2 DB3 AC1 AC0 DB0 0 0 0 1 AC5 AC4 AC3 AC2 Code RS RW DB7 DB6 DB5 DB4 DB1 DB2 DB3 AC1 AC0 DB0 0 0 1 AC6 AC5 AC4 AC3 AC2 Code RS RW DB7 DB6 DB5 DB4 DB1 DB2 DB3 AC1 AC0 DB0 |
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