{"id":5143,"date":"2021-02-26T03:50:12","date_gmt":"2021-02-26T03:50:12","guid":{"rendered":"http:\/\/fastbitlab.com\/?p=5143"},"modified":"2023-09-04T12:08:26","modified_gmt":"2023-09-04T06:38:26","slug":"stm32-uart-lecture-3-uart-frame-formats","status":"publish","type":"post","link":"https:\/\/fastbitlab.com\/blog\/stm32-uart-lecture-3-uart-frame-formats\/","title":{"rendered":"STM32 UART Lecture 3 &#8211; UART frame formats"},"content":{"rendered":"<div class=\"boldgrid-section\" style=\"background-image: linear-gradient(to left, #eeeeee, #eeeeee);\" data-bg-color-1=\"#EEEEEE\" data-bg-color-2=\"#EEEEEE\" data-bg-direction=\"to left\">\n<div class=\"container\">\n<div class=\"row\" style=\"padding-top: 50px; padding-bottom: 0px; background-image: linear-gradient(to left, #eeeeee, #eeeeee);\" data-bg-color-1=\"#EEEEEE\" data-bg-color-2=\"#EEEEEE\" data-bg-direction=\"to left\">\n<div class=\"col-md-1 col-sm-12 col-xs-12 col-lg-1\">\n<p>&nbsp;<\/p>\n<\/div>\n<div class=\"col-md-10 col-sm-12 col-xs-12 col-lg-10\">\n<h1 class=\"\" style=\"text-align: center; font-size: 30px; border-width: 0px; line-height: 50px;\"><span style=\"color: #000080;\">UART&nbsp;frame formats<\/span><\/h1>\n<div class=\"row bg-editor-hr-wrap\" style=\"border-width: 0px; margin-top: -25px;\">\n<div class=\"col-lg-12 col-md-12 col-xs-12 col-sm-12\">\n<div>\n<p>&nbsp;<\/p>\n<div class=\"bg-hr bg-hr-10 color2-color\" style=\"border-style: solid; border-width: 0px 0px 3px;\"><\/div>\n<p>&nbsp;<\/p>\n<\/div>\n<\/div>\n<\/div>\n<p class=\"\" style=\"border-width: 0px; font-size: 17px; line-height: 30px; font-family: 'Roboto Slab'; font-weight: 400;\" data-font-family=\"Roboto Slab\" data-font-weight=\"400\" data-font-style=\"\">In the previous article, we understand <span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"http:\/\/fastbitlab.com\/stm32-uart-lecture-2-understanding-uart-pins\/\" target=\"_blank\" rel=\"noopener\">UART pins<\/a><\/span>. In this article, let&#8217;s discuss URAT frame formats.<\/p>\n<p class=\"\" style=\"font-size: 20px; line-height: 30px; font-family: 'Roboto Slab'; font-weight: 400;\" data-font-family=\"Roboto Slab\" data-font-weight=\"400\" data-font-style=\"\"><span style=\"text-decoration: underline; color: #000080;\"><strong>UART Frame Formats<\/strong><\/span><\/p>\n<p class=\"\" style=\"border-width: 0px; font-family: 'Roboto Slab'; font-weight: 400; font-size: 17px; line-height: 30px;\" data-font-family=\"Roboto Slab\" data-font-weight=\"400\" data-font-style=\"\"><span style=\"font-weight: 400; color: #000000;\">A <strong>frame<\/strong> refers to the entire data packet which is being sent or received during the data communication. Depending upon the communication protocols, the format of the frame might vary.<\/span><\/p>\n<p class=\"\" style=\"border-width: 0px; font-family: 'Roboto Slab'; font-weight: 400; font-size: 17px; line-height: 30px;\" data-font-family=\"Roboto Slab\" data-font-weight=\"400\" data-font-style=\"\"><span style=\"font-weight: 400; color: #000000;\">For example, TCP\/IP has a particular frame format, whereas UDP has another frame format. Similarly, in our case, UART also has a frame format. The typical frame format of the UART has an order of bit, as shown in Figure 1.<\/span><\/p>\n<p class=\"\">&nbsp;<\/p>\n<figure id=\"attachment_5146\" aria-describedby=\"caption-attachment-5146\" style=\"width: 738px\" class=\"wp-caption aligncenter\"><img fetchpriority=\"high\" decoding=\"async\" class=\"wp-image-5146\" src=\"http:\/\/fastbitlab.com\/wp-content\/uploads\/2021\/02\/Figure-1-6.png\" alt=\"UART&nbsp;frame formats\" width=\"738\" height=\"367\" srcset=\"https:\/\/fastbitlab.com\/blog\/wp-content\/uploads\/2021\/02\/Figure-1-6.png 1835w, https:\/\/fastbitlab.com\/blog\/wp-content\/uploads\/2021\/02\/Figure-1-6-300x149.png 300w, https:\/\/fastbitlab.com\/blog\/wp-content\/uploads\/2021\/02\/Figure-1-6-768x382.png 768w, https:\/\/fastbitlab.com\/blog\/wp-content\/uploads\/2021\/02\/Figure-1-6-1024x509.png 1024w, https:\/\/fastbitlab.com\/blog\/wp-content\/uploads\/2021\/02\/Figure-1-6-600x299.png 600w, https:\/\/fastbitlab.com\/blog\/wp-content\/uploads\/2021\/02\/Figure-1-6-120x60.png 120w, https:\/\/fastbitlab.com\/blog\/wp-content\/uploads\/2021\/02\/Figure-1-6-500x249.png 500w, https:\/\/fastbitlab.com\/blog\/wp-content\/uploads\/2021\/02\/Figure-1-6-200x100.png 200w, https:\/\/fastbitlab.com\/blog\/wp-content\/uploads\/2021\/02\/Figure-1-6-400x199.png 400w, https:\/\/fastbitlab.com\/blog\/wp-content\/uploads\/2021\/02\/Figure-1-6-800x398.png 800w, https:\/\/fastbitlab.com\/blog\/wp-content\/uploads\/2021\/02\/Figure-1-6-1200x597.png 1200w\" sizes=\"(max-width: 738px) 100vw, 738px\" \/><figcaption id=\"caption-attachment-5146\" class=\"wp-caption-text\"><span style=\"color: #000000;\">Figure 1. Frame format for UART.<\/span><\/figcaption><\/figure>\n<p class=\"\">&nbsp;<\/p>\n<p class=\"\" style=\"border-width: 0px; font-family: 'Roboto Slab'; font-weight: 400; font-size: 17px; line-height: 30px;\" data-font-family=\"Roboto Slab\" data-font-weight=\"400\" data-font-style=\"\"><span style=\"font-weight: 400; color: #000000;\">It starts with a start bit, which is always low for a 1-bit duration. Then follows data bits from LSB to MSB, which usually occupies 5 to 9 bits. You can decide how many data bits have to be there in a frame between 5 to 9 bits using configuration registers in the UART peripheral. There is a parity bit followed by the data bits, and it is optional. You can choose either an even parity or odd parity mechanism. <\/span><\/p>\n<p class=\"\" style=\"border-width: 0px; font-family: 'Roboto Slab'; font-weight: 400; font-size: 17px; line-height: 30px;\" data-font-family=\"Roboto Slab\" data-font-weight=\"400\" data-font-style=\"\"><span style=\"font-weight: 400; color: #000000;\">Parity bit consumes a single bit. Finally, a frame ends with a stop bit. The stop bit is always high. You can configure for 1, 1.5, or 2-bit duration stop bits.<\/span><\/p>\n<p class=\"\">&nbsp;<\/p>\n<p class=\"\" style=\"border-width: 0px; font-family: 'Roboto Slab'; font-weight: 400; font-size: 17px; line-height: 30px;\" data-font-family=\"Roboto Slab\" data-font-weight=\"400\" data-font-style=\"\"><span style=\"color: #000000;\">In the following article, let&#8217;s see<\/span> <span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"http:\/\/fastbitlab.com\/stm32-uart-lecture-4-baud-rate\/\" target=\"_blank\" rel=\"noopener\">Baud Rate<\/a><\/span>.&nbsp;<\/p>\n<p class=\"\">&nbsp;<\/p>\n<p class=\"\" style=\"border-width: 0px; font-family: 'Roboto Slab'; font-weight: 400; font-size: 20px; line-height: 28px;\" data-font-family=\"Roboto Slab\" data-font-weight=\"400\" data-font-style=\"\"><span style=\"color: #000080;\"><b>FastBit Embedded Brain Academy Courses<\/b><\/span><\/p>\n<p class=\"\" style=\"border-width: 0px; font-size: 17px;\">Click here:&nbsp;<span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"http:\/\/fastbitlab.com\/course1\" target=\"_blank\" rel=\"noopener\">https:\/\/fastbitlab.com\/course1<\/a><\/span><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>&nbsp; UART&nbsp;frame formats &nbsp; &nbsp; In the previous article, we understand UART pins. In this article, let&#8217;s discuss URAT frame formats. UART Frame Formats A frame refers to the entire data packet which is being sent or received during the data communication. Depending upon the communication protocols, the format of the frame might vary. For [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":5146,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ocean_post_layout":"","ocean_both_sidebars_style":"","ocean_both_sidebars_content_width":0,"ocean_both_sidebars_sidebars_width":0,"ocean_sidebar":"0","ocean_second_sidebar":"0","ocean_disable_margins":"enable","ocean_add_body_class":"","ocean_shortcode_before_top_bar":"","ocean_shortcode_after_top_bar":"","ocean_shortcode_before_header":"","ocean_shortcode_after_header":"","ocean_has_shortcode":"","ocean_shortcode_after_title":"","ocean_shortcode_before_footer_widgets":"","ocean_shortcode_after_footer_widgets":"","ocean_shortcode_before_footer_bottom":"","ocean_shortcode_after_footer_bottom":"","ocean_display_top_bar":"default","ocean_display_header":"default","ocean_header_style":"","ocean_center_header_left_menu":"0","ocean_custom_header_template":"0","ocean_custom_logo":0,"ocean_custom_retina_logo":0,"ocean_custom_logo_max_width":0,"ocean_custom_logo_tablet_max_width":0,"ocean_custom_logo_mobile_max_width":0,"ocean_custom_logo_max_height":0,"ocean_custom_logo_tablet_max_height":0,"ocean_custom_logo_mobile_max_height":0,"ocean_header_custom_menu":"0","ocean_menu_typo_font_family":"0","ocean_menu_typo_font_subset":"","ocean_menu_typo_font_size":0,"ocean_menu_typo_font_size_tablet":0,"ocean_menu_typo_font_size_mobile":0,"ocean_menu_typo_font_size_unit":"px","ocean_menu_typo_font_weight":"","ocean_menu_typo_font_weight_tablet":"","ocean_menu_typo_font_weight_mobile":"","ocean_menu_typo_transform":"","ocean_menu_typo_transform_tablet":"","ocean_menu_typo_transform_mobile":"","ocean_menu_typo_line_height":0,"ocean_menu_typo_line_height_tablet":0,"ocean_menu_typo_line_height_mobile":0,"ocean_menu_typo_line_height_unit":"","ocean_menu_typo_spacing":0,"ocean_menu_typo_spacing_tablet":0,"ocean_menu_typo_spacing_mobile":0,"ocean_menu_typo_spacing_unit":"","ocean_menu_link_color":"","ocean_menu_link_color_hover":"","ocean_menu_link_color_active":"","ocean_menu_link_background":"","ocean_menu_link_hover_background":"","ocean_menu_link_active_background":"","ocean_menu_social_links_bg":"","ocean_menu_social_hover_links_bg":"","ocean_menu_social_links_color":"","ocean_menu_social_hover_links_color":"","ocean_disable_title":"default","ocean_disable_heading":"default","ocean_post_title":"","ocean_post_subheading":"","ocean_post_title_style":"","ocean_post_title_background_color":"","ocean_post_title_background":0,"ocean_post_title_bg_image_position":"","ocean_post_title_bg_image_attachment":"","ocean_post_title_bg_image_repeat":"","ocean_post_title_bg_image_size":"","ocean_post_title_height":0,"ocean_post_title_bg_overlay":0.5,"ocean_post_title_bg_overlay_color":"","ocean_disable_breadcrumbs":"default","ocean_breadcrumbs_color":"","ocean_breadcrumbs_separator_color":"","ocean_breadcrumbs_links_color":"","ocean_breadcrumbs_links_hover_color":"","ocean_display_footer_widgets":"default","ocean_display_footer_bottom":"default","ocean_custom_footer_template":"0","ocean_post_oembed":"","ocean_post_self_hosted_media":"","ocean_post_video_embed":"","ocean_link_format":"","ocean_link_format_target":"self","ocean_quote_format":"","ocean_quote_format_link":"post","ocean_gallery_link_images":"off","ocean_gallery_id":[],"footnotes":""},"categories":[8],"tags":[22],"class_list":["post-5143","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-stm32-uart-lecture","entry","has-media"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>STM32 UART Frame Formats: Start, Data, Parity, and Stop Bits<\/title>\n<meta name=\"description\" content=\"Explore UART (Universal Asynchronous Receiver\/Transmitter) frame formats, essential for serial data communication. 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