AT04357 RCB256RFR2-XPRO User Guide [USER GUIDE]
TBDA-MCU-09/2013
15
4.2.4
CLK (J4)
J4 enable easy connection to the CLK signals.
Table 4-4. J4 CLK
J4-pin
function
J4-1 CLKI
ATmega256RFR2 pin 33, Input to the clock system. If selected, it provides the operating clock
of the microcontroller.
J4-2
CLKO
ATmega256RFR2 pin 53, The device can output the system clock on the CLKO pin. To enable
the output, the CKOUT Fuse has to be programmed.
4.2.5
Current monitoring (J5)
J5 enables current monitoring using an external multimeter.
Connect multimeter between J5-1 and J5-2 and measure current used by the ZigBit
Table 4-5. J5 Current measurement
J5 Pin
function
1 - VCC_MCU_P3V3
3.3V pin on the ATmega256RFR2
2 - VCC_P3V3
3.3V on extension board
4.2.6
External power (J6)
J6 enable connection of external power supply when not inserted into an Xplaine PRO mother board.
The connector has reverse voltage protection.
