LSQ976-NR-1-0-20-R18 datasheet(28/50 Pages) MICROCHIP

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Wireless Security Remote Control Development Kit User’s Guide

DS41646A-page 28

 2012 Microchip Technology Inc.

5.2

HARDWARE DESCRIPTION

5.2.1

Serial Communications Connections

The Embedded Security Development Board is divided into two halves. The left side is

the host controller half. The right side is the target application half. The two halves are

connected by three wires labeled TP1, TP2, and TP3. Table 5-1 lists the respective

microcontroller I/O port connections.

The host controller half is controlled by a PIC16LF1947 microcontroller. The

PIC16LF1947 microcontroller communicates with a 16x2 character LCD display

(LCD1), an MCP2200 USB to UART communications IC (U2), an MCP795W10 SPI

Real-Time Clock Calendar IC (U5), four push button switches (SW5-SW8), and seven

LEDs (D8-D14). The PIC16LF1947 microcontroller can be programmed/debugged via

the ICSP™ header, J4. The host controller half schematic is shown in Appendix C as

Figure C-2.

The target application half has a PIC16LF1398 microcontroller. The PIC16LF1398

microcontroller communicates with the 28-pin PICtail connector (J1), Serial Accessory

Port (P20), four push button switches (SW1-SW4), and four LEDs (D4-D7). The

PIC16LF1398 microcontroller can be programmed/debugged via the ICSP header, J5.

The target application half schematic is shown in Appendix C as Figure C-3.

5.2.2

Serial Accessory Port (P20)

The Serial Accessory Port provides a simple serial interface for the external modules.

These modules may be either external sensor or accessory board. The partial list of

Microchip boards with SAP capabilities includes the following:

• LCD Serial Accessary Board

• RS232 Serial Accessary Board

For more information about the existing accessory boards, visit http://www.microchip.com

or refer to the “RS-232 Serial Accessory Board User’s Guide” (DS70649).

The following interfaces are supported by the Serial Accessory Port:

• 3 or 4 wire SPI

•I2C™

• USART

The on-board switch “S1” selects these interfaces. Jumpers J7 and J8 pull-up resistors

when I2C is selected and the pull-up resistors are not available on the daughter board.

Software modifications are expected to use those interfaces when pins are assigned

different functionalities. For more information on the port pin assignment, see the

schematic in Appendix C.

5.2.3

USB Interface Port

Microchip MCP2200 provides USB to UART support. MCP2200 provides automatic

conversion between UART and full-speed USB 2.0 communication. At the same time,

the USB interface port can be used to power the Embedded Security Development

Board directly. For more information, please refer to the Microchip MCP2200 data

sheet.

TABLE 5-1:

SERIAL COMMUNICATIONS CONNECTIONS

Host Controller PIC16LF1947

(Slave)

Test Points

Target Application PIC16LF1398

(Master)

RF5

TP1

RB7/ICSPDAT

RB2

TP2

RB6/ICSPCLK

RF4

TP3

RE3/

MCLR/VPP

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