Changing "modes"

These modules can be used in SPI or 8-Bit mode. Somewhat annoyingly, the only way to switch modes is to desolder/solder jumpers on the back of the modules.

8-Bit "6800" mode

Your module probably came with this setting by default. The R20 and R18 resistors are in place and the R21 and R19 are missing.

SPI Mode

This is the mode you likely want to be in. You'll need to remove the R18 and R20 resistors by heating up the resistor with a soldering iron and maybe even melting a little solder on. Then remove the resistor and solder in R19 and R21 either by placing the resistors there (or, really, any 0-10K 0805 resistor) or a piece of wire.

This guide was first published on Aug 05, 2015. It was last updated on Aug 05, 2015.

This page (Assembly) was last updated on May 12, 2021.

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