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UM1855 Hardware layout and configuration
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connectors on the daughterboard have three rows of holes each. One raw is routed to
segments of the LCD. The other two rows are interconnected and form a series of jumpers.
The way of inserting the LCD glass module daughterboard into CN11 and CN14 headers
determines two functions of LCD glass module daughterboard. In its display function,
STM32L476ZGT6 terminals are routed to LCD segments. In its I/O-bridge function, they are
not. Instead, they transit from one row of CN11 pins to the other and from one row of CN14
pins to the other, thanks to interconnections fitted by the LCD glass module daughterboard.
Figure 9 shows how the LCD glass module daughterboard must be positioned for display
function. This position is designated in the document as display position.
Figure 10 shows how the LCD glass module daughterboard must be positioned for I/O-
bridge function. This position is designated in the document as I/O-bridge position.
The arrow indicates the side of the CN11 and CN14 headers where the extra row of holes of
each female counterpart on the LCD glass module daughterboard has to protrude.
When the LCD glass module daughterboard is not plugged in, CN11 and CN14 give access
to ports of the target microcontroller. Figure 36 shows the related schematic diagram.
Table 14 shows the default settings of board configuration elements linked with CN11 and
CN14 extension connectors and LCD glass module daughterboard.
Figure 9. LCD glass module daughterboard in display position
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