{"id":2243,"date":"2025-04-15T08:48:03","date_gmt":"2025-04-15T08:48:03","guid":{"rendered":"https:\/\/webprojects.cloud\/wordpress\/splatco\/?post_type=spl_knowledgebase&#038;p=2243"},"modified":"2025-06-10T06:30:00","modified_gmt":"2025-06-10T06:30:00","slug":"obcb_starta-c-d19","status":"publish","type":"spl_knowledgebase","link":"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/programming-reference\/instructions-arranged-by-function\/counting-and-related-instructions\/obcb_starta-c-d19\/","title":{"rendered":"OBCB_StartA c [D>=19]"},"content":{"rendered":"\n<p><code>Start OBCB c in Phase A<\/code><\/p>\n\n\n\n<p>Start counting pulses on counting input\u00a0<code>c<\/code>\u00a0using the OnBoard Counter B (<a href=\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/glossary-of-terms\/#o370\">Firmware<\/a>) counter. Counting will start when the OBCB time base is in phase A. If the time base is in phase A when the instruction is executed, counting starts at once. If it is in phase B, counting will start when it next enters phase A.<\/p>\n\n\n\n<h6 class=\"wp-block-heading\">Arm Difference<\/h6>\n\n\n\n<p>In ARM, counting only occurs during phase A and does NOT occur during phase B.&nbsp; This means your SPLat application has plenty of time to &#8220;read &amp; clear&#8221; the count during phase B so when phase A next occurs counting will&nbsp;<strong>automatically<\/strong>&nbsp;start from zero.<br><br>In legacy boards the SPLat application must call OBCB_StopB to ensure counting stops.&nbsp; This however means it must repeat the process of starting again.&nbsp; If OBCB_StopB is not called then counting will occur during both phase A and B.<\/p>\n\n\n\n<p>+ The channel argument will be jndexed when executed inside a MultiTrack task and will be indexed if the instruction is preceded by the IasJ: precode.<\/p>\n\n\n\n<p><a href=\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/glossary-of-terms\/#o2825\">Dialect<\/a>\u00a0exclusions: Not available in dialects before 19.<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table class=\"has-fixed-layout\"><tbody><tr><td>Note: At time of writing there is no simulation of the OBCA in SPLat\/PC<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>See also:\u00a0<code><a href=\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/programming-reference\/instructions-arranged-by-function\/counting-and-related-instructions\/obcb_goifa-llll\/\">OBCB_GoIfA<\/a>, <a href=\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/programming-reference\/instructions-arranged-by-function\/counting-and-related-instructions\/obcb_goifb-llll-d19\/\">OBCB_GoIfB<\/a>, <a href=\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/programming-reference\/instructions-arranged-by-function\/counting-and-related-instructions\/obcb_start-c-d19\/\">OBCB_Start<\/a>, <a href=\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/programming-reference\/instructions-arranged-by-function\/counting-and-related-instructions\/obcb_stop-c-d19\/\">OBCB_Stop<\/a>, <a href=\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/programming-reference\/instructions-arranged-by-function\/counting-and-related-instructions\/obcb_stopb-c-d19\/\">OBCB_StopB<\/a>, <a href=\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/programming-reference\/instructions-arranged-by-function\/counting-and-related-instructions\/obcb_fread-c-d19\/\">OBCB_fRead<\/a>, <a href=\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/programming-reference\/instructions-arranged-by-function\/onboard-counter-b-obcb-instructions\/obcb_frdclr-c-d19\/\">OBCB_fRdClr<\/a><\/code><\/p>\n\n\n\n<p>Alternative counter mechanisms:\u00a0<a href=\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/programming-reference\/instructions-arranged-by-function\/onboard-counter-a-obca-instructions\/onboard-counter-type-a\/obca-introduction\/\">OnBoard Counter A<\/a>,\u00a0<a href=\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/programming-reference\/instructions-arranged-by-function\/onboard-quadrature-counter\/\">OnBoard Quadrature Counter<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Start OBCB c in Phase A Start counting pulses on counting input\u00a0c\u00a0using the OnBoard Counter B (Firmware) counter. Counting will start when the OBCB time&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":2213,"menu_order":29,"template":"","class_list":["post-2243","spl_knowledgebase","type-spl_knowledgebase","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>OBCB_StartA c [D&gt;=19] - 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=\"OBCB_StartA c [D&gt;=19] - SPLat Controls\" \/>\n<meta property=\"og:description\" content=\"Start OBCB c in Phase A Start counting pulses on counting input\u00a0c\u00a0using the OnBoard Counter B (Firmware) counter. 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