Specifications
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SPECIFICATIONS:
Motorola 68HC11 CPU A0, A1, A8, E2, or E9 versions can be used.
256kbit (32Kbyte) Dallas 10 year battery-backed memory module, no need to use EPROMs or slower
EEPROMs.
Compact size 2” X 2.85”.
Interactive C compatible LCD interface.
Network capable, Serial Peripheral Interface (SPI).
Jumper selectable reset address. Reset vector can be located at 0xFFFE,0xFFFF or 0xBFFE,0xBFFF
improved over the Handy Board.
No expensive hardware programmer needed, programs can be downloaded using a standard serial
port.
Easily expandable, using standard headers. List of Headers:
Port A of 68HC11, 8 multi function I/O pins (JP8)
Port E of 68HC11, 8 analog channels (JP7)
Memory mapped I/O, Finger Board can be easily expanded to have 32 digital inputs and 32 digital
output lines (JP9)
IRQ and XIRQ lines brought out for external interrupts (JP11)
Standard 9pin serial port (P1).
SPI high speed serial interface (JP4)
LCD display interface (JP2)
Sharp IR receiver input (JP10)
Speaker output (JP12)
Infrared transmitter output (JP13)
MODB select (JP18)
External A/D reference input (JP6)
Optional external battery backup capable (JP19)
Optional Low Dropout voltage regulator
Optional remote reset through serial port
Optional real time clock
Power requirements:
7 to 18volts DC. Can easily run from a 9volts DC battery.
Current consumption: 24 ma DC without communications board < 10ma in WAIT mode, or STOP
mode. 30ma with communications board
For remote data logging - using an Alkaline 9volt battery to supply power, we were able to get 19
hours using the Finger Board without the communications board, but with an attached LCD for
display. The total current draw was ~25 ma. The LCD display typically draws about ~1ma.
For low battery situations and Solar Cell applications. Special modifications can be made to the
Finger Board. With a few easy component changes, we were able to bring the current draw down to
22ma. By changing the voltage regulator to a low dropout version, the Finger Board was able to run
from 26volts down to 4.8volts. These application specific modifications are posted on our web site.
Dimensions:
CPU board only: 2.85” long, 2.0” wide
Communications board: 1.15” long, 2.0” wide
CPU board with attached Communications board: 4” long, 2.0” wide