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{{Sends instructions as opposed to a character to the LCD no variables are used }} PUB SEND_INSTRUCTION (D_DATA) 'set up for writing instructions CHECK_BUSY 'wait for busy bit to clear before sending OUTA[ReadWrite] := 0 'Set up to read busy bit OUTA[RegSelect] := 0 'Set up to read busy bit OUTA[Enable] := 1 'Set up to toggle bit H>L OUTA[DataBit7..DataBit4] := D_DATA 'Ready to READ data in OUTA[Enable] := 0 'Toggle the bit H>L to Xfer the data {{Sends an instruction as opposed to a character to the LCD no variables are used }} PUB SEND_INSTRUCTION2 (D_DATA) 'set up for writing instructions CHECK_BUSY 'wait for busy bit to clr before sending OUTA[ReadWrite] := 0 'Set up to read busy bit OUTA[RegSelect] := 0 'Set up to read busy bit OUTA[Enable] := 1 'Set up to toggle bit H>L OUTA[DataBit7..DataBit4] := D_DATA>>4 'Ready to READ data in OUTA[Enable] := 0 'Toggle the bit H>L to Xfer the data OUTA[Enable] := 1 'Set up to toggle bit H>L OUTA[DataBit7..DataBit4] := D_DATA 'Ready to READ data in OUTA[Enable] := 0 'Toggle the bit H>L to Xfer the data {{Sends a single character to the LCD in two halves }} PUB SEND_CHAR (D_CHAR) 'set up for writing to the display CHECK_BUSY 'wait for busy bit to clear before sending OUTA[ReadWrite] := 0 'Set up to send data OUTA[RegSelect] := 1 'Set up to send data OUTA[Enable] := 1 'go high OUTA[DataBit7..DataBit4] := D_CHAR>>4 'Send high 4 bits OUTA[Enable] := 0 'Toggle the bit H>L OUTA[Enable] := 1 'go high again OUTA[DataBit7..DataBit4] :=D_CHAR 'send low 4 bits OUTA[Enable] := 0 'Toggle the bit H>L

Some adhesives are prone to run-out or bleeding caused by their separation into individual liquid components that together comprise the adhesive material When bleeding by a component liquid occurs beyond of the adhesive deposit, that bleeding liquid can contaminate nearby solderable surfaces In the case of very dense circuit boards, excessive migration of the whole adhesive migration, or the bleeding of one of its components, can contaminate the pads of other components, affecting their placement and solderability Although the function of the adhesive is to anchor components in place for the soldering process, the adhesive deposit remains as a part of the assembly after soldering, and as such must not interfere with next-assembly steps or negatively impact the long-term reliability of the circuit board For example, some epoxies readily absorb moisture or other organic compoundsThose absorbed materials may outgas during subsequent temperature excursions that could contaminate critical surfaces (e.

g, sensors) when the product is in service Therefore, it is important to select only adhesive materials that are qualified for a particular application Adhesives materials that are used in electronics assembly processes are typically based upon epoxies or silicones Adhesives can also be described by the following four functional/materials categories: thermosetting adhesives, thermoplastic adhesives, elastomer adhesives, and toughened alloy adhesives Each group differs in its compositions, the type of curing cycle, and its pre- and post-cure material properties The curing cycle, which typically requires an elevated temperature/time profile, must not degrade the components present on the board or the laminate itself It is understood that the added step of a curing cycle slows the overall assembly process Thermosetting adhesives cure by heat or a catalytic reaction that cross-links the polymer chains Once cured, these materials remain very strong and will not readily soften at elevated.

temperatures Epoxies are one group of thermosetting adhesives, which are used widely in electronics assembly because they do not weaken at the high temperatures of wave and reflow soldering environments Also, epoxies are resistant to attack by solvents and aqueousbased cleaning solutions Epoxies can be one-part, in which the curing agent and resin are already mixed together, or two-part, in which the two chemistries are combined prior to application Although the one-part epoxies are convenient from the assembly standpoint, their storage and handling must be rigidly controlled to prevent curing prior to use Both epoxies are cured by exposure to elevated temperatures, which can range from less than 100 C to as high as 125 to 150 C, for time periods of 1 to 4 hours, depending on the specific product recommendations There is very little outgassing associated with the curing of thermosetting adhesives.

Higher residual stresses can be generated by these materials due to their rigidity at elevated temperatures when there is a significant thermal expansion mismatch among the package, the epoxy, and the circuit board substrate The permanency of thermosetting adhesives complicates repair or rework functions The removal of these adhesives usually requires mechanical scraping and abrasion that can damage the component and circuit board Thermoplastic adhesives soften when exposed to elevated temperatures These adhesives are weaker than thermosetting epoxies However, when tolerances are less restrictive, these materials may be preferred for assembly applications, particularly when excessive residual stresses are of concern during the soldering process temperature cycle Thermoplastic materials are less resistant to solvents and aqueous-based materials These adhesives tend to absorb these liquids more readily, resulting in dimensional changes (swelling) and more outgassing than is observed with thermosetting adhesives.