User's Manual

1323x Remote Control Motherboard

1323x Development Hardware Reference Manual, Rev. 1.0

4-10 Freescale Semiconductor

4.2.3 1323x-RCM Onboard Peripheral Functions

The 1323x-RCM has a rich set of peripheral functions useful to evaluate the MC13233 and to implement

a full featured remote control.

4.2.3.1 USB Interface

For many applications or demonstrations it is desirable to connect the 1323x-RCM to a PC or other device.

A USB port is provided with a USB “B” receptacle plug. The port is connected to a FTDI FT232RQ USB

<> UART device that appears as a Virtual COM port (VCP) to the PC. PC drivers are available with the

module.

The USB interface is configured as a "Bus Powered" device and can draw all required power from the USB

interface. The device is USB 2.0 full speed compatible.

The USB connector is designated as J15. Figure 4-5 shows the connector pinout.

Figure 4-5. USB Connector Pinout

4.2.3.2 128x32 Graphic/Alphanumeric LCD

The 1323x-RCM supports a 128x32 pixel STN passive trans-reflective monochrome graphic LCD that

provides for alphanumeric or graphic readout. The LCD module is mounted on top of the main circuit

board and connects via a 16-pin connector. Figure 4-6 shows the LCD interface schematic.

• The display is an CRYSTALFONZ #CFAG12832A-YGH-N

• Viewing area is 51.0 (W) × 17.8 (H) mm

• The LCD operates from 5 Vdc generated from the main operating voltage through a boost

switching regulator. The LCD module requires a highly regulated 5 V so that the high voltages

generated onboard the display are consistent.

• The LCD has optional yellow-green LED backlighting

— Typical current of 30 mA when full on

— Enabled via Jumper J10

— Always on when enabled.

• LCD interface to the MCU is via the SPI port - although the LCD module only supports a parallel

interface (8-bit or 4-bit modes), the 1323x-RCM uses a serial interface derived from the SPI port

— The SPI serial stream is loaded into an 8-bit shift register (74AHCT164) used as a

serial-to-parallel converter

-D

J15

USB_TY PE_B

DATA_P

DATA_M

V_BUS