Applications Engineering
5.4.2. JP2: Power LED (D4) and RS232 (U7) Transceiver Power
JP2 is used to connect the Vcc pin of the RS232 transceiver chip (U7) to the 3.3V supply of the board. It also connects the red Power LED (D4) to the board’s supply. It can be used to reduce the board’s power consumption by disconnecting the RS232 transceiver and Power LED. For normal operations, JP2 must be shorted.
JP2 is shorted by default.
5.4.3. Default Jumper Settings
Table
Jumper | Default |
| Setting |
JP1: MCU Power | Shorted |
JP2: Power LED and RS232 Power | Shorted |
5.5. LCD (Liquid Crystal Display)
The LCD is a
5.6. ZigBee RF
The ZigBee RF circuit utilizes a ZMD 44102, 900MHz, IEEE 802.15.4 compliant transceiver IC.
6.0 Limitations of the ZbRom System
The following is a list of limitations for the ZbRom system. Due to the nature of this evaluation system, the MCU resources that you can use for your own application development are restricted. In addition, many of the configurations and customizations offered by the ZigBee protocol stack are unavailable to you with the ZbRom.
Please do not modify or disrupt any of the MCU resources used by the ZigBee stack:
6.1. Timers
Table
TA0 | available |
TA1 | Used by ZigBee stack |
TA2 | Used by ZigBee stack |
TA3 | Used by ZigBee stack |
TA4 | Used by RTOS |
TB0 | Used by ZigBee stack |
TB1 | available |
TB2 | Used by ZigBee stack |
August 2006 |