LSQ976-NR-1-0-20-R18 datasheet(29/50 Pages) MICROCHIP

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Embedded Security Development Board

 2012 Microchip Technology Inc.

DS41646A-page 29

5.2.4

PICtail Port

The PICtail port is a 28-pin interface port that supports Microchip’s RF-based daughter

cards. The PICtail port provides the following interfaces to the daughter cards:

• Power Supply

• SPI interface

• Interrupt request lines

• Other digital/analog I/O lines

There are many Microchip accessory daughter cards, which have PICtail port

connectivity. When not used as one of the components in the Wireless Security Remote

Control Development Kit, the Embedded Security Development Board can be

connected with any daughter board with PICtail port, and perform different

functionalities. Refer to the Microchip web site http://www.microchip.com for accessory

daughter boards with PICtail port.

5.2.5

LCD Display

The Embedded Security Development Board supports 16x2 character LCD display with

backlight. The LCD is controlled by the host microcontroller through the SPI port. For

details about the LCD display, refer to the data sheet of NHD-C0216CZ-FSW-FBW-3V3

by Newhaven Display (http://www.newhavendisplay.com).

5.2.6

Real-Time Clock and Calendar (RTCC) Module

The Embedded Security Development Board RTCC module can be used to set and

track clock and calendar precisely. The RTCC functionality is achieved with the

Microchip MCP795W10. The RTCC module is controlled by the host microcontroller

through the SPI interface. The RTCC module can be powered either by the 3.3V power

from the Embedded Security Development Board, or by a separate coin battery when

external power is not available. For details on operating this RTCC module, refer to the

data sheet of the MCP795W10 at http://www.microchip.com/MCP795W10.

5.2.7

Push Buttons

The Embedded Security Development Board has two sets of push buttons. Each set

consists of four individual push buttons and serves as input to the host and target

application microcontrollers.

The four push buttons for the target application microcontroller are read as a single

analog input. Depending on the different ratios of pull-up and pull-down resister values,

the input analog voltages to the master microcontroller are different. Therefore, through

the ADC on the target application microcontroller, the button that is pressed can be

identified. Such design is used to save I/O pin requirement for the target application

microcontroller. The details of the push buttons design can be found in the schematics

in Appendix C.

The four push buttons for the host microcontroller are four separate digital inputs to the

slave microcontroller, due to the abundant I/O pin availability for the slave

microcontroller. All buttons are assigned to the individual interrupt lines of the

microcontroller and are not driven by external pull-up circuitry to save power

consumption. The user software must enable the PORTB pull-ups of the

microcontroller before evaluating the button state.

Note:

The user must be careful about the PICtail port pins that share different

functions of the board. The user needs to check the schematics before

assigning functions for any port pin.

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