C 8 0 5 1 F 4 11 - E K
2
Rev. 0.1
Figure 1. C8051F411 Evaluation Board Block Diagram
The SELECT, UP, and DOWN buttons are used to navigate through the menus and choose the desired options.
These buttons also have special functionality depending upon the current mode.
3.2. Reset Button and LEDs
The remaining push button is connected to the RESET pin of the C8051F411. Pressing this button puts the device
into its hardware-reset state.
Two LEDs are also provided on the evaluation board:
D2–The bi-color LED indicates communications between the PC and the DEBUG USB port.
D3–The red LED labeled “DEMO PWR” indicates a power connection to the evaluation board.
3.3. DEMO/DEBUG Interface (J1)
The evaluation board DEMO/DEBUG USB port (J1) provides the interface between a PC USB port and the
C8051F411’s in-system debug/programming circuitry.
4. Evaluation Modes
The C8051F411 Evaluation Board has two modes: Keepsake mode and Demo mode. In Keepsake mode, the
‘F411 uses the 32.768 kHz RTC crystal as the system clock. Demo mode allows the user to vary the internal
oscillator and internal voltage regulator configuration. The board is in Keepsake mode upon powerup.
4.1. Keepsake Mode
Upon powerup, the evaluation board is in Keepsake mode (see Figure 2). Keepsake mode can be used when the
board is powered from the batteries or the USB bus. In Keepsake mode, the device displays the following
information:
Time (in the upper-right hand corner of the LCD)
Date (in the lower section of the LCD)
Temperature (in the lower section of the LCD)
The time is persistent in the upper right-hand corner. The date (month and day) and temperature will be alternately
displayed in the lower section of the LCD. By default, the temperature is displayed in Celsius.
Notes:
1.
Pressing the UP button while in Keepsake mode will force the LCD to display only the temperature and not
the date. Pressing UP again will cause the LCD to switch between the date and temperature as normal.
2.
Pressing the DOWN button while in Keepsake mode will switch the display between a 12-hour clock and 24-
hour clock.
C8051F411 EB Bottom
SA-TB32-PCB
Ba
ttery Holder
ME
N
U
SELECT
DO
WN
UP
RESET
SoftBaugh
SoftBaugh
U1
“F411”
U10
F321
D3
DEMO PWR
DEMO/DEBUG
D2
U8
U7
U6
U3
U4
U5
SILICON LABORATORIES
C8051F411 EB
SW6
J1
VBAT
VDD
