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Microcontroller I/O Map
MCU
Pin
RA0
RA1
RA2
RA3
RA5
RA6
RA7
Default
Connection
mikroBUS1 RX
mikroBUS1 TX
mikroBUS1 AN
mikroBUS1 RST
mikroBUS1 PWM
mikroBUS2 RST
mikroBUS2 CS
RB0
RB1
RB2
RB3
RB4
RB5
RB6
RB7
mikroBUS1 INT
mikroBUS2 AN
mikroBUS2 RX
mikroBUS2 TX
mikroBUS SCK/SCL
mikroBUS SDI/SDA
mikroBUS SDO
mikroBUS1 CS
RC0
RC1
RC2
RC4
RC5
RC6
RC7
X2 (MCU RTCC Osc.)
X2 (MCU RTCC Osc.)
BattV
USB DUSB D+
GSM RX
GSM TX
RD0
RD1
RD2
RD3
RD4
RD5
RD6
RD7
Relay0
Relay1
Relay2
Relay3
Relay4
Relay5
mikroBUS2 PWM
mikroBUS2 INT
RE0
RE1
RE2
GSM Pwr_Key
GSM Reset
GSM Status
Alternative
Connection
Notes
X1 (MCU Ext. Osc.)
X1 (MCU Ext. Osc.)
PGC
PGD
GSM Sig
JP6
Relay6
Relay7
JP8
JP9 (Also, JP2 – U3 shutdown)
Note:
JP3/JP4 can be used to cut power to the relays (whilst leaving their LEDs working).
JP7 can be used to disable both the relays and their LEDs.
Ports A, B and D are also exposed via IDC10 headers J20, J21 and J22.
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