Usb Debug Adapter - Silicon Laboratories C8051F12X User Manual

9. USB Debug Adapter

The USB Debug Adapter provides the interface between the PC's USB port and the C8051F12x's in-system
debug/programming circuitry. The attached 10-pin DEBUG ribbon cable connects the adapter to the target board
and the target device's debug interface signals. (The USB Debug Adapter supports both Silicon Laboratories JTAG
and C2 debug interfaces.) Power is provided to the adapter from the USB connection to the PC. The USB Debug
Adapter is capable of providing power to a circuit board via pin 10 of the DEBUG connector. The C8051F120 Tar-
get Board is not designed to be powered from this source. Table 8 shows the pin definitions for the DEBUG ribbon
cable connector.
Notes:
• The USB Debug Adapter requires a target system clock of 32 KHz or greater.
• With the default settings, the USB Debug Adapter can supply up to 100 mA to a target system.
Table 8. USB Debug Adapter DEBUG Connector Pin Descriptions
Pin # Description
1,8 Not Connected
2,3,9 GND (Ground)
4 TCK (C2D)
5 TMS
6 TDO
7 TDI (C2CK)
10 USB Power
Figure 6. USB Debug Adapter
Rev. 0.6
C8051F12x-DK
11