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User Manual - Rev1.0.2 Multiplexed Functions
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5 MULTIPLEXED FUNCTIONS
In order to propose the largest panel of functions possible to the user, we have multiplexed and mapped
a maximum of the RA6M3 pins towards the board’s devices and peripherals. Some of these functions
can be selected by removing/soldering multiple shunts on the board. By default, the SDRAM, the SD
Card, the CTS2 mikroBUS TM and the USBFS VBUS pins are deactivated and not connected to the
RA6M3. Table 49 shows you which functions are multiplexed between which peripherals/devices.
Table 49. Multiplexing Function Table
SDRAM SD CARD mikroBUS CTS2 USBFS
Serial Flash QSPI/SDHI
JTAG TDI / CTS2 / IRQ11
mikroBUS
DATA / SPI0 PMOD1
PMOD2
Main I²C SDA SDA0_B / USB_VBUS
SSIE: Audio
Codec
ADDR / SSIE0
mikroBUS: UART ADDR / SCI2
mikroBUS: I²C
ADDR / SCI6
PMOD1
PMOD2
A05 / RST
DQM0 / IO9
SDCLK / IO10
If the SDRAM is selected, these peripherals/functions are deactivated
Functions which are active by default
The Sections 5.1 to 5.4 describe you how each function can be selected and which functions will be
affected doing so.
Also, the shunt footprints used on the PCBA are compliant with 0603 footprint resistors and are shaped
to ease and quicken the rework with a drop of solder. Figure 28 illustrates the shunt’s footprint shape.
Figure 28. Shunt Footprint