UG-176 Evaluation Board User Guide
Rev. 0 | Page 4 of 16
5. Click Start in the I2CWSD dialog box to connect the
I2CWSD download software with the ADuC7023 bootloader
(see Figure 5).
9195-005
Figure 5. I2CWSD Application Showing a Valid ADuC7023 ID String Response
EMULATION INTERFACE
Nonintrusive emulation and download are possible on the
ADuC7023 via JTAG by connecting a JTAG emulator to the J4
connector.
USING P0.4 AND P0.5 AS I
2
C PINS
The ADuC7023 evaluation boards use an I
2
C-to-USB transceiver
chip, the FT2232H, that allows the ADuC7023 to be programmed
directly over the USB interface without any need of an external
dongle. However, the FT2232H does drive the P0.4/P0.5 pins of
the ADuC7023 by default. To isolate these pins from the FT2232H,
run the Reset_Ft2232h_Io.exe utility, which can be downloaded
from the ADuC7023 product page on the Analog Devices website.
This utility configures the P0.4/P0.5 connection to the FT2232H as
input pins, which stops the FT2232H from driving these pins.
Execute this utility if the P0.4/P0.5 pins are intended for any use
other than interfacing with the PC via the USB transceiver.
Run the executable from the Command window, as shown in
Figure 6.
09195-012
Figure 6. How to Open a Command Window
9195-013
Figure 7. Command to Enter to Run Reset_Ft2232h_Io.exe
Go to the directory where the Reset_Ft2232h_Io.exe utility is
copied on the PC (see Figure 7 and Figure 8).
09195-014
Figure 8. Expected Text after Running Reset_Ft2232h_Io.exe
CRYSTAL CIRCUIT
The board is fitted with a 32.768 kHz crystal, from which the
on-chip PLL circuit can generate a 41.78 MHz clock.
EXTERNAL REFERENCE (ADR291E)
The external 2.5 V reference chip, U2, is provided on the
evaluation board to demonstrate the external reference option
of the ADuC7023.
RESET/DOWNLOAD/IRQ1 PUSH-BUTTONS
A reset push button is provided to allow users to reset the part
manually. When pressed, the
RST
pin of the is pulled
to DGND. Because the
ADuC7023
RST
pin on the is Schmidt-
triggered internally, there is no need to use an external Schmidt
trigger on this pin.
ADuC7023
When pressed, the IRQ1 push-button switch drives the P1.1 pin
high. This can be used to initiate an External Interrupt 1.
On the evaluation board, serial download mode can be easily
initiated by holding down the
SERIAL DOWNLOAD
push button
(S2) while pressing and releasing the
RESET
button (S3), as
shown in the section. Also, ensure
that Flash Address 0x80014 contains 0xFFFFFFFF.
I
2
C Programming Interface
