AN2344 Freescale Semiconductor / Motorola, AN2344 Datasheet - Page 7

• Manufacturer Part Number: AN2344
• Description: HC908EY16 EMI Radiated Emission Results
• Manufacturer: Freescale Semiconductor / Motorola

Test PCB Software
MOTOROLA
The flash memory of the microcontroller is programmed with a test routine that
exercises two timer channels, the SPI, the ESCI, the ATD and also toggles
some port pins. An LED is placed on the output of port pin B5. The software
routine toggles this output at a set point during a cycle to verify that the code is
still being executed correctly.
As discussed previously, the testing on the microcontroller is performed in two
configurations. In the external crystal configuration, an 8.000MHz crystal is
connected to the DUT on the TEM Cell board in order to generate an internal
bus frequency of 2MHz. In the ICG configuration, the internal bus frequency is
set to 2MHz in software. The initialization of the clock source is the only
difference between the software routines for the two configurations.
A flowchart for the test software used is shown in Appendix B.
Freescale Semiconductor, Inc.
HC908EY16 EMI Radiated Emissions Results
For More Information On This Product,
Go to: www.freescale.com
Figure 5. TEM CELL PCB BOTTOM LAYER
TEM Cell Test Board Information
AN2344/D
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