C 8 0 5 1 F 3 4 x
8
Rev. 0.3
4.3. Universal Serial Bus (USB) Interface (J14)
A Universal Serial Bus (USB) connector (P3) is provided to facilitate connections to the USB interface on the
C8051F340. Table 2 shows the J14 pin definitions.
4.4. PORT I/O Connectors (J2 - J6)
In addition to all port I/O signals being routed to the 96-pin expansion connector, each of the five parallel ports of
the C8051F340 has its own 10-pin header connector. Each connector provides a pin for the corresponding port
pins 0–7, +3.3 VDC and digital ground. Table 3 defines the pins for the port connectors. The same pin-out order is
used for all of the port connectors.
4.5. USB Self-Powered Configuration (J8)
The C8051F340 target board can be configured as a self-powered USB device to take power from the USB cable
instead of the ac/dc adapter connected at P1. To configure the target boards as a self-powered USB device, short
the VREGIN and VBUS pins on the J8 header
Note: When the C8051F340 target board is self-powered from the USB, the Serial Adapter is not powered from the
target board. The Serial Adapter must be powered directly by connecting the ac/dc adapter to the Serial Adapters’
dc power jack. Also, the RS232 Serial Interface (P4) cannot be used when powering the target board from the
USB.
Table 2. USB Connector Pin Descriptions
Pin #
Description
1
VBUS
2
D-
3
D+
4
GND (Ground)
Table 3. J12–J19 Port Connector Pin Descriptions
Pin #
Description
1
Pn.0
2
Pn.1
3
Pn.2
4
Pn.3
5
Pn.4
6
Pn.5
7
Pn.6
8
Pn.7
9
+3 VD (+3.3 VDC)
10
GND (Ground)
