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EM6620WS27 数据表(PDF) 34 Page - EM Microelectronic - MARIN SA |
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EM6620WS27 数据表(HTML) 34 Page - EM Microelectronic - MARIN SA |
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34 / 56 page  R EM6620 Copyright © 2005, EM Microelectronic-Marin SA 34 www.emmicroelectronic.com 11. RAM The EM6620 has one 64x4 bit RAM built-in located on addresses hex 0 to 3F. All the RAM nibbles are direct addressable. RAM Extension : Unused R/W Registers can often be used as possible RAM extension. Be careful not to use registers which start, stop, or reset some functions. Unused LCD register latches can also be used as RAM extension. In case of 3 times multiplex and using all the 8 segment outputs you may have two additional 4 bit registers available. Also for each unused segment output you may have one additional 4 bit register. Figure 24. RAM Architecture RAM1_63 RAM1_62 RAM1_61 RAM1_60 RAM1_0 4 bit R/W 4 bit R/W 4 bit R/W 4 bit R/W 4 bit R/W . . . . . . RAM1_3 RAM1_2 RAM1_1 4 bit R/W 4 bit R/W 4 bit R/W 64 x 4 direct addressable RAM1 |
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