Silicon Laboratories TOOLSTICK C8051F850 User Manual page 9

desired state from the drop-down menu and click the Set Selected Pin States button.
The firmware on the C8051F850 target microcontroller does not need to be customized to use the UART and
communicate with ToolStick Terminal. The firmware on the microcontroller should write to the UART as it would in
any standard application, and all of the translation is handled by the ToolStick Base Adapter.
6. Using the C8051F850 Daughter Card as a Development Platform
The prototyping area on the ToolStick C8051F850 Daughter Card makes it easy to interface to external hardware.
All of the digital I/O pins are available, so it is possible to create a complete system.
6.1. C8051F850 Pin Connections
It is important to note that if external hardware is being added, some of the existing components on the board can
interfere with the signaling. The following is a list of port pins on the C8051F850 that are connected to other
components:
See the daughter card schematic in Section 7 for more information.
6.2. C2 Pin Sharing
On the C8051F850, the C2CK and C2D debug pins are shared with the /RST and P2.0 pins respectively. The
daughter card includes the resistors necessary to enable pin sharing, which allows the /RST and P2.0 pins to be
used normally while simultaneously debugging the device. See Application Note "AN124: Pin Sharing Techniques
for the C2 Interface" at www.silabs.com/products/mcu/Pages/ApplicationNotes.aspx
pin sharing.
Table 1. ToolStick Daughter Card Pin Functions
MCU Pin ToolStick Daughter Card Function
P0.0
P0.1
P0.2
P0.3
P0.4
P0.5
P0.6
P0.7
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
P2.0
P2.1
TOOLSTICK850DC-UG
UART TX
UART RX
red LED DS1
red LED DS2
potentiometer R10
GPIO0/RTS
GPIO1/CTS
Switch S1
C2D Pin Sharing
Switch S2
Rev. 0.2
for more information regarding
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