Hardware Reference; Locating "Pin 1; Switches; S1: Dip Switch - Applied Data Systems Bitsy User Manual

3 Hardware Reference

This section gives an overview of the hardware features of the Bitsy. This overview includes a
description of the switches, jumper settings, connectors and connector pinouts.

3.1 Locating "Pin 1"

Many connectors and headers have a visible number on the board that indicates pin 1. If that pin
is not clearly marked, there are two other ways to locate pin 1:
1. The easiest method is to look at the underside of the board. The square pad is pin 1.
2. You can determine pin 1 from the mechanical drawing provided in section 4.2.

3.2 Switches

3.2.1 S1: DIP Switch

S1 is a four-position DIP switch. It connects to the system/interrupt controller. The settings of
some individual switches can be read from the SA1111 I/O, others are available for off board use.
Some operating systems on the Bitsy reserve these switches for their use. Consult the operating
system manual for details.
TM
3.3 ADSmartIO
ADSmartIO
functionality for specialized tasks. Your application software can configure the standard
ADSmartIO
PS/2 keyboard operation.

3.4 Onboard LEDs

The Bitsy has one onboard LED mapped as follows:

3.5 Jumper Settings

Jumpers on the Bitsy select a variety of operational options. All use 2mm shorting blocks (shunts)
to select settings. Make sure power is turned off to the Bitsy when changing the position of a
shunt.

3.5.1 JP1, JP2: VEE Contrast Voltage Control

Type: 2-post header, 2mm
These jumpers are used when configuring the VEE voltage between a positive output and a
negative output.
ADS document # 110111-1003A
TM
is a second RISC microcontroller on the Bitsy. This device provides additional I/O
TM
firmware for a variety of functions, including digital I/O, PWM, A/D, keypad and
Signal GPIO line
LED0 20
JP1,2 Jumper setting
1-2
2-3
Part Designator
D3
Voltage Selected
Negative VEE
Positive VEE
Bitsy User's Manual
Color
Green
Page 7