3.8 mikroBUS Socket

One mikroBUS socket, J500-J501, is available on the development board. This socket can be used to expand the functionality using the MikroElectronika Click boards^TM. The mikroBUS connector consists of two 1x8 female headers with SPI, I²C, UART, RST, PWM, analog, and interrupt lines as well as 3.3V, 5V, and GND power lines. For additional information on the interface and Click boards, refer to the MikroElectronika webpage.

Note that some of these pins are shared with both Extension headers and Arduino UNO R3 headers.

Figure 3-12. mikroBUS Headers (J500 and J501) Schematic

Table 3-6. mikroBUS Socket Pin Assignment
Pin Number	Pin Name	Description	GPIO
1	AN	Analog	PA07
2	RST	Reset	PB17
3	CS	SPI Chip Select	PC17
4	SCK	SPI Clock	PC18
5	MISO	SPI Host Input Client Output	PC16
6	MOSI	SPI Host Output Client Input	PC19
7	+3.3V	VCC-3.3V power	VCC_P3V3
8	GND	Reference Ground	GND
9	GND	Reference Ground	GND
10	+5V	VCC-5V power	VCC_P5V0
11	SDA	I²C Data	PD01
12	SCL	I²C Clock	PD00
13	TX	UART Transmit	PD16
14	RX	UART Receive	PD15
15	INT	Hardware Interrupt	PC03
16	PWM	PWM output	PC02