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LC7982A Datasheet(PDF) 10 Page - Sanyo Semicon Device |
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LC7982A Datasheet(HTML) 10 Page - Sanyo Semicon Device |
10 / 18 page • Character count setting In character display mode, HN specifies the number of characters displayed in the horizontal direction. In graphics mode, HN specifies the number of bytes displayed in the horizontal direction. The total number of dots displayed on the screen in the horizontal direction is given by the following formula. n = HP × H N HN can be set to an even number in the range 2 to 256 (decimal). • Time division setting (display duty) NX specifies the time division setting. That is, the display duty is set to 1/NX. NX can be set to a value in the range 1 to 256 (decimal). • Cursor position setting In character display mode, CP specifies the line where the cursor is displayed. For example, if CP is set to 8 (decimal), the cursor will be displayed under the character for a 5 × 7 font. The length of the cursor in the horizontal direction will be equal to horizontal direction character pitch HP. While CP can be set to any value in the range 1 to 16 (decimal), if it is set to a value less than or equal to the vertical direction character pitch VP (CP ≤ VP), the cursor display will take priority when cursor display is enabled. Note that if CP > VP, the cursor will not be displayed. The length of the cursor in the horizontal direction will be equal to HP. • Display start position low-order address • Display start position high-order address These instructions together write the display start address value into the display start address register. The display start address specifies the RAM address where the data to be displayed at the upper left of the screen is stored. The start address is a 16-bit value formed from high-order and low-order bytes. • Cursor address (low order) setting (RAM read/write low-order address) No. 5946-10/18 LC7982A Register R/W RS DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 Instruction register 0 1 0 0 0 0 0 0 1 0 Character count register 0 0 (HN – 1) binary Register R/W RS DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 Instruction register 0 1 0 0 0 0 0 0 1 1 Duty register 0 0 (NX – 1) binary Register R/W RS DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 Instruction register 0 1 0 0 0 0 1 0 0 0 Display start address register 0 0 (Start address low-order byte) binary (Low-order byte) Register R/W RS DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 Instruction register 0 1 0 0 0 0 1 0 0 1 Display start address register 0 0 (Start address high-order byte) binary (High-order byte) Register R/W RS DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 Instruction register 0 1 0 0 0 0 1 0 1 0 Cursor address counter 0 0 (Cursor address low-order byte) binary (Low-order byte) Register R/W RS DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 Instruction register 0 1 0 0 0 0 0 1 0 0 Cursor position register 0 0 0 0 0 0 (CP – 1) binary |
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