Specifications

Headers are counted in the same pattern as drawn on the schematic diagram. When possible we

have placed the label closest to pin 1 on the printed circuit board. Pin 1 is marked with a square pad.

See silkscreen top view drawing.

JP1 is the DC input connector used to power the Finger Board. You can use any voltage from 7 to 18

volts.

Function

1 +Battery input

2 ground

JP2 is an Interactive C compatible LCD interface. If you have the 14 x 1 type connector on your LCD,

you should be able to rewire with the pattern shown.

Function Pin Function

1 ground 2 VCC

3 ground 4 A9

5 A8 6 PA4

7 D0 8 D1

9 D2 10 D3

11 D4 12 D5

13 D6 14 D7

JP4 is an SPI high-speed serial peripheral interface. There are lots of industry SPI compatible devices

that can be attached to this port.

For those who wish to connect two Finger Boards together using the SPI port, you must not connect

pin 2 (VCC) together between the Finger Boards. Doing so will short out the voltage regulators. You

can use a straight through IDC ribbon cable but cut out pin 2 from one or both of the JP4 headers.

For other SPI devices, pin 2 can be used to supply +5 volt power. The 5 volt source is taken from the

onboard 7805 voltage regulator.

Pins 7 and 8 on the header are not connected. They can be wired up to user determined chip selects.

Function Pin Function

1 ground 2 VCC n/c not connected

3 SS 4 MISO

5 SCK 6 MOSI

7 n/c 8 n/c

JP6 analog A/D reference input voltage. For normal use, pins 1 and 2 are shorted and pins 3 and 4

are shorted together using jumper shunts. See "M68HC11 Reference Manual" for further info.

Function Pin Function

1 VRH 2 VCC

3 VRL 4 ground