The QED Board is a legacy product not available for new customers. If you're looking
for a HC11-based single-board computer programmable in C or Forth, consider Mosaic's
QCard™ Controller. For a faster and more powerful platform with the same
compatibility with our all of our Wildcard™ Modular I/O Boards,
consider the PDQ Board™.
For existing customers looking for QED Board documentation, see a summary of
specifications below, or download full documentation PDF files here:
Processor's address space is expanded to 8 Megabytes.
Digital Input and Output
The 68HC11F1 processor provides 16 digital I/O lines. Additionally, an
onboard peripheral interface adaptor provides three 8 bit I/O ports named
Peripheral Ports A, B, and C. Of these 40 user-configurable lines, 28 are
uncommitted and the remainder implement high-current driver outputs and the
96K minimum up to 512K maximum.
320 bytes of EEPROM are available for the user.
There are 3 memory sockets on the board:
Socket 1 accommodates 256K Flash.
Socket 2 accommodates a 32K or 128K SRAM with optional battery backup. 128K SRAM is standard.
Socket 3 is available to accommodate the optional battery-backed real-time clock.
High Current Drivers
Four open-drain MOSFET drivers are brought out to the keypad/display
connector. Each driver can sink up to 150 mA continuously, and up to 1 amp on an
intermittent basis. Onboard snubber diodes allow control of inductive loads.
An optional real-time clock socket can be installed under the 32K RAM in
memory socket 2. It battery backs the RAM and is fully supported by onboard
Timer Controlled Input and Output
3 or 4 input capture functions facilitate accurate detection of pulse edges
and measurement of pulse widths.
4 or 5 output compare functions make it easy to create complex waveforms and
pulse-width modulated signals.
A pulse accumulator facilitates frequency measurement and pulse counting.
Keypad and Touchscreen Interface
A twenty button (4 x 5) keypad connects via a direct cable interface and is
read by a pre-coded keypad scanning routine.
A touchscreen overlay is available with the graphics display.
Analog to Digital Conversion
8 channels of 8 bit A/D conversion with up to 100 kHz sampling frequency.
8 channels single-ended or 4 channels differential 12 bit A/D conversion with
up to 30 kHz sampling frequency. Unipolar (0 to 5V input) and bipolar (-5 to 5V
input) conversions are supported.
An LCD display connects via a direct cable and is controlled by pre-coded
driver routines. The interface supports:
Alphanumeric displays of up to 4 lines by 20 characters, or
A 128 x 240 pixel graphics display with a 2.5" by 4.5" viewing area that
displays 16 lines of text with 40 characters per line.
Digital to Analog Conversion
8 channels of 8 bit multiplying digital-to-analog conversion.
Pairs of D/A converters may be combined to yield higher resolution (11+ bits)
A hardware UART supports either RS232 or RS485 at up to 19.2 Kbaud. The RS232
transmitter can be tri-stated to implement full-duplex multidrop communications.
A second software UART implements an RS232 interface at up to 4800 baud.
A fast synchronous serial peripheral interface (SPI) provides communications
at speeds up to 2 megabaud.
The onboard D/A converter and 12 bit A/D are controlled via the SPI.
75 mA average current consumption at +5 volts.
Onboard regulation converts 6-12VDC into a +5V regulated 750 mA primary supply
as well as a 10 mA secondary supply used by onboard analog circuitry.
A digital shutdown signal can turn off the primary supply, reducing power
consumption to 30 mW.
The board can be directly powered by a regulated +5V supply.
A power monitor ensures orderly power up/power down.
A power fail early warning signal is generated onboard.
An EMI filter and a power surge protector are on the board.
A watchdog timer and clock monitor ensure orderly reset if a processor error
All connectors use standard shrouded single or dual row .025" square posts on
a 0.1" centerline pitch.
40 pin digital I/O and control bus, dual row.
40 pin analog I/O bus, dual row.
40 pin address/data bus, dual row.
34 pin interface connector (keypad and display), dual row.
10 pin serial communications connector, dual row.
6 pin power connector, single row.
21 interrupts support the 68HC11's on-chip subsystems.
Size and Weight
3.2" x 4.0" surface-mount board weighs 3.5 oz (100 g).