Link here

Overview and specifications
9S12/HCS12 development board hardware and software specifications

The PDQ Board Lite embedded design platform hosts extensive analog and digital I/O (input/output), as well as multiple communications lines. This instrument development/prototyping board provides the following I/O and functionality:

  • 16 lines of 10-bit resolution analog inputs (also configurable in banks of 8 as digital inputs)
  • 8 lines digital I/O on port T for counter/timer capability or general purpose I/O
  • 8 lines digital I/O on port P for 8-bit or 16-bit resolution PWM (pulse-width-modulated) or general purpose I/O
  • 8 lines general purpose digital I/O on Port M
  • 1 I2C communications port; I2C signals SDA and SCL are pulled up onboard by 4.7K resistors
  • 2 RS232 serial communications ports. Both normal, full-voltage RS232 and noninverted, logic-level signals are available for both serial ports.
  • 2 additional logic-level serial ports available on port T using the Software UART library
  • 2 SPI ports are available on a 10-pin header.
  • 9 KB (kilobytes) RAM for runtime variables and data
  • 336 KB Flash for application code and user libraries
  • Requires only +5V power, delivered via the digital IO header, or via a standard micro-B USB receptacle mounted on the PDQ Board Lite
  • Includes a prototyping area to simplify the development and mounting of custom circuitry
Freescale 9S12 HCS12 Development Board and SBC Block Diagram
Fig. 1  Block diagram of the PDQ Board Lite HCS12 Development Board

Power supply

The PDQ Board Lite is powered from a regulated 5V source, and draws 35-50mA in the absence of any external connections. Power may be applied to the board at one of several locations. You can apply +5V and ground to:

  • the USB micro B type receptacle (H12);
  • solder holes in the board's prototyping area
  • Digital I/O header (H10) or Analog I/O header (H4);
  • Wildcard headers (H3 and/or H9).

The PDQ Board Lite starter kit (Part number PDQBL-SK) comes with a 5V 0.5A-1A universal switching wall-mount supply that connects to the micro-B USB receptacle on the board.



While the PDQ Board contains memory that is both within the processor and external to it, the PDQ Board Lite uses only the memory provided on the microcontroller chip itself. Even so, there is still plenty of on-chip memory for programming, including:

  • 336 KB Flash memory for your application code, I/O drivers, and libraries;
  • 9 KB RAM for your application's variables and data structures; and,
  • 384 bytes EEPROM for nonvolatile storage of changeable data, such as calibration constants.

See Memory Allocation for a full description of the addresses and uses of the PDQ Board Lite's EEPROM, Flash, and RAM.



This page is about: 9S12 HCS12 MCU Freescale Development Board Electrical Specifications, Analog and Digital I/O, 9S12 HCS12 Memory Allocation – Detailed electrical and hardware specifications for a 9S12 HCS12 MCU development board including analog and digital I/O, RS232, I2C, PWM, SPI signals, and RAM page and Flash memory allocation and paging. HCS12 9S12 MCU specs, 9S12 HCS12 hardware software interfacing