ATmega168 Xplained Mini User Guide [USER GUIDE]
42250A-MCU-02/2014
11
J100 pin
Signal function
2
GND
3
JTAG_TDO
4
VCC (5V0)
5
JTAG_TMS
6
RESET
7
NC
8
NC
9
JTAG_TDI
10
GND
2.3.2
USB (J101)
J101 is a USB2.0 A PCB connector connecting the board to the PC.
Table 2-2. USB
J101 pin
Function
1
VBUS
2
D-
3
D+
4
GND
2.3.3
USART (J102)
The ATmega32U4 UASRT signals are available on J102.
Table 2-3. J102 USART
J102 pin
ATmega32U4 ATmega168
Function
1 - UART TXD
PD3
PD1
TxD from ATmega32U4
2 - UART RXD
PD2
PD0
TxD from ATmega168
2.3.4
ATmega168 Digital I/O (J200 and J201)
J200 and J201 provide access to ATmega168 digital I/O pins.
Table 2-4. J200
J200 pin & location
ATmega168 pin
J200-1/ I11
PB0
J200-2
PB1
J200-3
PB2
J200-4
PB3
J200-5
PB4
J200-6
PB5
J200-7
GND
J200-8
AREF
J200-9
PC4
J200-10
PC5
Table 2-5. J201
J201 pin
ATmega168 pin
J201-1
PD0
