BDD: Header3 on an Arduino Mega2560R3

Gallery
Tutorial
TRAIL: A SysMLv1.6+ model of the Arduino Mega2560Rev3 microcontroller board
Section
1: A Webel recipe for modelling microcontrollers in SysML
Topic level
INTERMEDIATE
UML keywords
custom Stereotype
icon
Stereotype:icon
SysML keywords
Block
Keywords
Slide kind
SysML Block Definition Diagram (BDD)

All pins on the 3rd header of the Mega2560 only involve the ATmega2560 mcu chip or the ground GND, +5V, +3V3, and VIN nets:

Click on the image to view it full size
MagicDraw/Cameo supports embedding images in diagrams
Some pins of interest:
  • The :NC just means "no connection" and does nothing.
  • The :IOREF pin is in fact just connected to the +5V net.
  • The :RESET pin does eventually make it to the corresponding ATmega2560 pin, but it is part of a wider net involving also reset of the ATmega16u2, so it is mapped only to a RESET net.
  • Four of the digital I/O pins also act as JTAG test pins: TDI (Test Data In); TDO (Test Data Out); TCK (Test Clock); 4. TMS (Test Mode Select).
Up next
IBD: Arduino Mega2560R3 - headers with pins and logical ports
Notes
[CAPABILITY, FEATURE, TIP, TOOL] In MagicDraw/Cameo an assigned stereotype of a Classifier that types an instance-like element (such as a part Property) "shines through" unless it has an instance-level stereotype assigned. This is sometimes called a "secondary stereotype".
[NAMING, POLICY, STYLE]{STRONG} SysML: Webel: "Trust the Type!" - Often the name of the Type of an anonymous Property or instance-level element is completely sufficient to indicate its role - unless multiple Properties of the same Type have different roles within the same owner context!
[NAMING, POLICY, STYLE] "Trust the Port or Pin Type!" - Often the name of the Type of an anonymous Port or Pin is completely sufficient to indicate its role, unless a clear indication of its direction or unique role is required.
[CAPABILITY, FEATURE, TOOL]{INFORMATIVE} MagicDraw/Cameo supports embedding images in diagrams
Snippets (quotes/extracts)
 JTAG (named after the Joint Test Action Group which codified it) is an industry standard for verifying designs and testing printed circuit boards after manufacture.
 JTAG: The connector pins are: 1. TDI (Test Data In); 2. TDO (Test Data Out); 3. TCK (Test Clock); 4. TMS (Test Mode Select); 5. TRST (Test Reset) optional.
Visit also
Visit also (backlinks)
Related slides (includes other tutorials)
Related slides (backlinks, includes other tutorials)
IBD: Header3 on an Arduino Mega2560R3 - connections