User manual

SAM9N12/CN11-EK User Guide 4-23

11186A–ATARM–29-Nov-12

4.4 Connectors

4.4.1 Power Supply

Figure 4-28. Power Supply Connector J1

4.4.2 JTAG/ICE Connector

re 4-29. JTAG J4

Table 4-7. Power Supply Connector J1 Signal Descriptions

Pin Mnemonic Signal description

1 Center +5V

2Floating

3GND

Table 4-8. JTAG/ICE Connector J4 Signal Descriptions

Pin Mnemonic Signal Description

1 VTref. 3.3V power

This is the target reference voltage. It is used to check if the target has power,

to create the logic-level reference for the input comparators, and to control the

output logic levels to the target. It is normally fed from VDD on the target board

and must not have a series resistor.

2 Vsupply. 3.3V power

This pin is not connected in SAM-ICE. It is reserved for compatibility with other

equipment. Connect to VDD or leave open in target system.

nTRST TARGET

RESET - Active-low

output signal that

resets the target

JTAG Reset. Output from SAM-ICE to the reset signal on the target JTAG port.

Typically connected to nTRST on the target CPU. This pin is normally pulled

HIGH on the target to avoid unintentional resets when there is no connection.

4 GND Common ground.