User's Manual

System Overview and Functional Descriptions
1322x-USB Reference Manual, Rev. 1.1
Freescale Semiconductor 3-5
3.6 Clock
The MC1322x device has a primary reference oscillator of 24 MHz. Crystal X1 is used with the MC1322x
for the reference oscillator.
3.7 Reset Switch and LEDs
The USB dongle provides the following
• One green Power-On LED (D5)
• One red LED (D1) is driven by the MCU and controlled by the software application.
• Reset switch to the wireless node; does not reset the USB interface device.
Refer to Figure 3-4 for location of switches and LEDs.
3.8 FLASH Memory Recovery Jumpers and Erase
The MC1322x has an onboard serial FLASH that stores the memory image that gets loaded into RAM at
boot. If it becomes necessary to change or update the image in FLASH, there are two possible means of
doing so:
• JTAG Debug Port - if the JTAG connector is mounted and the ARM debug tools are in use, the
FLASH image can be changed.
• Load new FLASH image via USB port:
— The Freescale BeeKit IDE download provides a software tool called Test Tool. This application
runs on a PC and can be used with a client running on the MC1322x to test the platform.
— Test Tool also has the capability to load a new image into the FLASH through the USB port.
However, the FLASH must first be cleared.
The 1322x USB Dongle/Zniffer has two jumper sites designated as J3 and J4 (see Figure 3-8) located on
the non-component (back) side of the PCB (see Figure 3-5). Use these jumper sites to erase the FLASH.
1. Short Jumper J3 Pin 1 to Pin 2.
2. Short Jumper J4 Pin 1 to Pin 2.
NOTE
For development purposes SMD headers can be soldered to the header sites
to make this action easily done with shorting bars.
3. Power on the USB board by plugging it into a USB port.
4. Push the reset button on the USB board.
Table 3-1. Switch and LED Summary
Item Connection Feature
PWR (green) VCC ‘Power On’ indication
LED1 (red) KBI_1 Application specific
SW5 RESETB Reset to MC1322x