Mosaic embedded designs » Embedded controllers » Operator interfaces » QVGA embedded computer

QVGA Controller™
I/O-Rich Embedded Computer Sports Advanced Graphical User Interface

QVGA instrument front panel with touch screen monitor and human machine interface HMI

Notice: Legacy Product

The QVGA Controller is a legacy product not available for new customers. If you're looking for a HC11-based integrated touchscreen controller programmable in C or Forth, consider Mosaic's QScreen™ Controller, which is compatible with our all of our Wildcard™ Modular I/O Boards.

For existing customers looking for QVGA documentation, see a summary of specifications below, or find the full QVGA documentation on Mosaic's Documentation Web.

Block Diagram

block diagram of qvga instrument controller with touch screen control operator interface panel



  • 16 MHz mc68hc11
  • 8 MB address space

Onboard Memory

  • 384K FLASH Memory
  • 256K RAM with 128K RAM optionally battery backed
  • 320 bytes EEPROM

Memory Expansion

Onboard memory expandable to

  • 768K FLASH Memory
  • 640K RAM with 128K RAM optionally battery backed
  • 16 or 64 Mbyte Wildcard compact flash mass memory


  • 21 interrupts support I/O subsystems

Real-Time Clock

  • Optional real-time clock (rtc)

Touchscreen/Display User Interface

  • High contrast CCFL white-on-blue monochrome LCD display with software controlled backlight and contrast
  • 5.7" diagonal (3.5" x 4.6"), 320 x 240 pixel display
  • High resolution transparent analog touchscreen with software controlled beeper for audible feedback

Digital Input and Output

  • 28 user-configurable I/O lines including:
    • 3 or 4 input capture functions
    • 4 or 5 output compare functions
    • Pulse accumulator
  • Four open-drain high-current outputs with onboard snubbers drive 150 mA continuously or 1 amp intermittently


  • 8 to 24 VDC
  • 4 W
  • 0.5 W per Wildcard I/O module
  • Onboard regulation, EMI filter and surge protection


  • RS232 or RS485 hardware UART at up to 19.2 Kbaud
  • RS232 software UART at up to 4800 baud
  • Fast synchronous serial peripheral interface (SPI) at up to 2 megabaud

Digital to Analog Conversion

  • 8 channels of 8 bit multiplying D/A conversion, cascadable

Analog to Digital Conversion

  • 8 channels of 8-bit A/D at up to 100 kHz sampling rate
  • 8 channels single-ended or 4 channels differential 12-bit A/D at up to 30kHz sampling rate with unipolar (0 to +5V) or bipolar (-5 to +5V) input


  • 40-pin digital I/O
  • 40-pin analog I/O
  • 38-pin supplemental digital I/O
  • 2, DB-9 serial ports
  • 10-pin serial communications
  • 10-pin power connector and modular power jack
  • 2, 24-pin Wildcard headers

Runtime Security

  • Watchdog timer and clock monitor

I/O Expansion

Modular Wildcards provide additional I/O for:

  • 16- or 24-bit resolution A/D
  • 12-bit D/A
  • Isolated AC or DC solid state relays
  • 16 or 64 Mbyte Compact Flash
  • Logic level, high voltage, and high current digital I/O
  • RS232, RS422 or RS485

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