Wireless Security Remote Control Development Kit User’s Guide
The MCLR push button is connected to the RE3/MCLR pin of the target application
microcontroller. The RE3/MCLR pin of the target application microcontroller is also one
of the SPI lines that control the host microcontroller. When the target application and
host microcontrollers are interconnected, the RE3/MCLR pin of target application
microcontroller is configured to be a normal digital I/O pin; therefore, the MCLR push
button is ineffective. Otherwise, if an SPI intercommunication is not required between
the target application and host microcontroller, the pin can be configured as RESET
and the MCLR button can be used.
5.2.8
LEDs
There are two sets of LEDs that are controlled by the target application and host
microcontrollers, respectively. The target application MCU controls a set of four LEDs
through the digital output pins. The host MCU controls a set of six LEDs through digital
output pins. The two sets of LEDs may be useful in the demo or debugging process.
Two LEDs (D15, D16) on the left half are used to identify the TX and RX operation of
MCP2200. They cannot be controlled by the target application or host microcontroller.
Similarly, LED D2 indicates the power availability. This LED cannot be controlled either
by the target application or the host microcontroller.
5.2.9
Power Supply
The Embedded Security Development Board can be powered by one of the following
two sources:
• USB port
• External 3.3V power source through GND and +VEXT connectors
Jumper J6 is used to choose the power source. When the left side, pins 1-2 of J6, are
closed, USB power is selected; when the right side, pins 2-3 of J6, are closed, external
power source is selected.
When the USB port is used to power the board, the input voltage is stabilized by
Microchip MCP1703, 250 mA, 3.3V and low quiescent current LDO regulator U3.
5.2.10 ICSP™ Programming/Debugging Ports
There are two ICSP™ programming/debugging ports on the Embedded Security
Development Board. The ICSP port J4 on the left is used to program the host
microcontroller. The ICSP port J5 on the right is used to program the target application
microcontroller. Figure 5-2 shows the ICSP ports.
FIGURE 5-2:
ICSP™ PROGRAMMING/DEBUGGING PORTS
ꢀ
ꢀ
Masterꢀ
ICSP port
Slaveꢀ
™
ICSP™ portꢀ
ꢀ
DS41646A-page 30
2012 Microchip Technology Inc.
MICROCHIP [ MICROCHIP ]
