User manual

Overview
 2015 Microchip Technology Inc. DS40001812A-page 15
MCU Interface to J35 mikroBUS
(1)
9 J48 Connects the microcontroller SDO pin
to the J35 mikroBUS MOSI (SPI
Master Output Slave Input) pin.
E.g. RC5 is configured as the
microcontroller SDO pin.
J49 Connects the microcontroller SDI pin
to the J35 mikroBUS MISO (SPI
Master Input Slave Output) pin.
E.g. RC4 is configured as the
microcontroller SDI pin.
J50 Connects the microcontroller SCK pin
to the J35 mikroBUS SCK (SPI Clock)
pin.
E.g. RC3 is configured as the
microcontroller SCK pin.
10 J41 Connects the microcontroller RX pin to
the J35 mikroBUS UART RX pin.
E.g. RC7 is configured as the
microcontroller RX pin.
J42 Connects the microcontroller TX pin to
the J35 mikroBUS UART TX pin.
E.g. RC6 is configured as the
microcontroller TX pin.
Other Connections and Interfaces
(1)
11 J4, J31 Connections depend whether RA5
and RA4 are configured as an I/O port
or as a VCAP pin.
E.g. RA5 is configured as an I/O port
while RA4 as a VCAP pin.
12 J37 Selects whether RA6 or the RA5 pin
be connected to the external 8 MHz
crystal (Y1).
E.g. The 8 MHz crystal is connected to
the MCU OSC2/RA5 pin.
13 J36 Selects whether RA7 or the RA4 pin
be connected to the external 8 MHz
crystal (Y1).
E.g. The 8 MHz crystal is connected to
the MCU OSC1/RA7 pin.
14 J15, J16 Option to power the Digilent Pmod
with 3.3V or 5V.
E.g. J17 Pmod
is supplied with 5V
while J20 Pmod
is supplied with 3.3V
15 J14, J30 Selects either 3.3V, 5.0V or a variable
voltage for the board’s supply
E.g. The board is supplied with 5V.
TABLE 1-1: ON-BOARD JUMPERS DESCRIPTION AND SAMPLE
CONFIGURATION (CONTINUED)
Label Jumper/s Description Configuration
RC7
RC5
RB4
RC4
RB6
RC3
RC5
RC7
RC4
RC6
VCAPRA5
J4
VCAPRA4
J31
RA5
RA6
RA7
RA4
+5V+5V
+3.3V
J15 J16
+5V
+3.3V
J30
J14
V_VAR