Useful facts about the HC11 Vandymatic Development Kit

Roberto Schipp

The HC11 VandyMatic Development Kit (HC11-VDK) is the third generation of 8 bit microprocessor development boards designed at Vanderbilt University. HC11-VDK is a single board microcomputer based on Motorola's MC68HC11 MCU, an advanced single chip MCU with a variety of on-chip memory and peripheral functions. HC11-VDK is a low cost development tool which can be used to debug downloaded user code intended for MC68HC11 target systems.

Hardware Features

• MC68HC11A1/2MHz with MC68HC24 PRU including:
  • HCMOS (speed, latchup, power, density)
  • 256 bytes SRAM
  • 512 bytes EEPROM
  • 8 bit A/D
  • serial interface SCI/SPI
  • 16 bit free running timer (3 IN, 5 OUT, 1 RTI)
  • 8 bit pulse accumulator to measure events
  • COP
  • ILLOP INT
  • software controlled power saving modes
  • IRQ / XIRQ
  • 5 multi-purpose I/O ports

• 2 RS232 ports with SCN2681

• 1 RS422 port

• 1 IEEE488 port

• 1 real-time clock/calendar w/ optional battery backup

• up to 3 8Kx8 SRAM @ 250ns

• up to 3 8Kx8 ROM/EPROM/OTP @ 250ns

• single stepping clock input down to DC

• single +5V/.5A supply (others optional)

• full expansion capabilities through 3 headers

• on-board spare sockets for user projects

• hardware reset

• power LED

Software Features

• 8Kx8 ROM

• improved 680x instruction set

• auto configuration upon bootup (user configurable w/DIP switch)

• auto RAM test and initialization

• user SP/PC and register auto initialization

• user register display and editing

• fully accessible, remapped vector table

• dynamically expandable command set and functions

• single stepping

• breakpoints

• help screen

• command line editing and parsing

• case insensitive commands

• user accessible I/O functions/library

• remote downloading

• onboard assembler / disassembler (w/ option ROM)

• memory editing / dumping

Specifications

Physical dimensions

• Width: 9 inches
• Depth: 6 inches
• Height: 1 inch (maximum w/ wire-wrap sockets)

Electrical requirements

• Voltage: +5VDC to 30VDC (depending on configuration)
• Current: 500mA max (fully operating)

• Note: adding peripherals to the headers may require additional power. Board is fused at 1A (by definition --JJR)

Environment

• Temperature: 50 to 91F (10 to 33C)
• Humidity: 20 to 80% RH

FCC Regulations

This equipment is for laboratory use only and does not comply with FCC regulations Part 15. The board may cause interference to radio communications without using proper precautions.

Safety Consideration

Wearing of safety glasses is recommended when using open

Installation

Operating equipment requirements

In addition to the HC11-VDK, a power supply (see Specifications) and an RS232 terminal (9600,8,1,n) connected to J2 with a null-modem cable is required to operate the board.

Quick installation

1. Place the board on a non-conductive surface

2. Install jumper J15 if a +5VDC power supply is used

3. Install jumper J9 between positions 2-3

4. Remove jumpers J6, J7, J8, J14, J10 (NOTE: Do NOT install J10, this is a battery connector which will damage the board if installed !)

5. Connect J2 to a terminal (9600,8,1,n)

6. Optionally connect J3 to a host system (9600,8,1,n)

7. Set all DIP switches to OFF

8. Connect a +5VDC/500mA min power supply (wall module type) to J1

DIP Switch configuration

The DIP switch S2 is only used during board reset and can be used otherwise for user programs. The following options are currently available upon board reset.

Copyright © 2002 Vanderbilt University