{"id":2613,"date":"2025-04-16T06:46:14","date_gmt":"2025-04-16T06:46:14","guid":{"rendered":"https:\/\/webprojects.cloud\/wordpress\/splatco\/?post_type=spl_knowledgebase&p=2613"},"modified":"2025-06-10T12:05:04","modified_gmt":"2025-06-10T12:05:04","slug":"shadowread-mmcc","status":"publish","type":"spl_knowledgebase","link":"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/programming-reference\/instructions-arranged-by-function\/index-register-instructions\/shadowread-mmcc\/","title":{"rendered":"ShadowRead mm*+,cc"},"content":{"rendered":"\n

[mm..(mm+cc-1)] = [shadow_mm..(shadow_mm+cc-1)]<\/code><\/p>\n\n\n\n

Read from non-volatile shadow memory to\u00a0RAM<\/a>. Start at address (location number)\u00a0mm<\/code>\u00a0and read\u00a0cc<\/code>\u00a0bytes. If the shadow memory has not been previously written to, it will contain 0.<\/p>\n\n\n\n

Data in the shadow memory is retained even when the power goes off.<\/p>\n\n\n\n

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

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

+ From dialect 16 the address argument will be\u00a0jndexed<\/a>\u00a0when executed inside a\u00a0MultiTrack<\/a>\u00a0task and will be indexed if the instruction is preceded by the\u00a0IasJ:<\/a><\/code>\u00a0precode.<\/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 reading 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>\u00a0etc) 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>\u00a0exclusions: Not available in dialects before 10.<\/p>\n\n\n\n

See also\u00a0ShadowWrite<\/a>\u00a0ShadowClear<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

[mm..(mm+cc-1)] = [shadow_mm..(shadow_mm+cc-1)] Read from non-volatile shadow memory to\u00a0RAM. Start at address (location number)\u00a0mm\u00a0and read\u00a0cc\u00a0bytes. If the shadow memory has not been previously written to,…<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":2572,"menu_order":38,"template":"","class_list":["post-2613","spl_knowledgebase","type-spl_knowledgebase","status-publish","hentry"],"acf":[],"yoast_head":"\nShadowRead 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=\"ShadowRead mm*+,cc - SPLat Controls\" \/>\n<meta property=\"og:description\" content=\"[mm..(mm+cc-1)] = [shadow_mm..(shadow_mm+cc-1)] Read from non-volatile shadow memory to\u00a0RAM. 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