{"id":2721,"date":"2025-04-16T09:36:00","date_gmt":"2025-04-16T09:36:00","guid":{"rendered":"https:\/\/webprojects.cloud\/wordpress\/splatco\/?post_type=spl_knowledgebase&p=2721"},"modified":"2025-06-10T13:22:32","modified_gmt":"2025-06-10T13:22:32","slug":"shadowclear-mmcc","status":"publish","type":"spl_knowledgebase","link":"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/programming-reference\/instructions-arranged-by-function\/memory-instructions\/shadowclear-mmcc\/","title":{"rendered":"ShadowClear mm*+,cc"},"content":{"rendered":"\n

Clear (write 0 to) a region of cc bytes of non-volatile shadow memory starting at address (location number) mm. Data in the shadow memory is retained even when the power goes off.<\/p>\n\n\n\n

The R register will be set to 0 if the clear operation is successful. It will be set to 1 if the clear fails.<\/p>\n\n\n\n

Caution<\/strong>: If the start address mm plus the count cc add up to an address beyond the end of RAM<\/a>, the board will generate a fatal runtime error and reset.<\/p>\n\n\n\n

Notes (see the product documentation for your specific board for details):<\/p>\n\n\n\n

    \n
  1. The shadow memory has a finite endurance. A shadow memory location will wear out after a certain number of write or clear operations.<\/li>\n\n\n\n
  2. This instruction takes a comparatively long time. During that time the SPLat processor is doing nothing and may miss fast input and will not service timers.<\/li>\n<\/ol>\n\n\n\n

    This instruction can be used in indexed mode, i.e. iShadowClear.<\/p>\n\n\n\n

    + From dialect 16 the address argument will be jndexed<\/a> when executed inside a MultiTrack<\/a> task and will be indexed if the instruction is preceded by the IasJ:<\/a><\/code> precode.<\/p>\n\n\n\n

    Note that the index or jndex offset is I or J single bytes. This can produce unexpected results if you are clearing for example jndexed floating point data.<\/p>\n\n\n\n

    Shadow memory is not affected by downloading a new program to the controller. That means any user setup parameters (for example) will remain unchanged. That represents both an advantage and a risk. If you change your program or we change the way we allocate RAM (defBYTE<\/a><\/code> etc) you could have problem, because suddenly your parameters are no longer at the expected addresses. You should therefore consider using absolute RAM addresses (mEQU<\/a><\/code>) to allocate RAM to user parameters.<\/p>\n\n\n\n

    Dialect<\/a> exclusions: Not available in dialects before 10.<\/p>\n\n\n\n

    See also ShadowWrite<\/a> ShadowRead<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

    Clear (write 0 to) a region of cc bytes of non-volatile shadow memory starting at address (location number) mm. Data in the shadow memory is…<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":2664,"menu_order":57,"template":"","class_list":["post-2721","spl_knowledgebase","type-spl_knowledgebase","status-publish","hentry"],"acf":[],"yoast_head":"\nShadowClear mm*+,cc - SPLat Controls<\/title>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ShadowClear mm*+,cc - SPLat Controls\" \/>\n<meta property=\"og:description\" content=\"Clear (write 0 to) a region of cc bytes of non-volatile shadow memory starting at address (location number) mm. 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