Hardware
HI-TECH Software XA Single Board Computer
Introduction

The XA Single Board Computer from HI-TECH Software is designed to allow a potential user of the XA microcontroller to evaluate the chip, or implement a first prototype without the time and expense of producing a custom PCB.

XA Single Board Computer
Lucifer Source Debugger
Pin Connections and Memory Map

Entire Manual (PDF)*
Entire Manual (HTML)

*Acrobat files require the Acrobat Reader from Adobe.

Pin connections
Pin connections for the various connectors on the XA Single Board Computer are shown in the diagram below.

 

The signals on each connector are given in the tables below

Table 3 - 1 J1 - I/O Pin Signal 1 In 0 2 In 1 3 In 2 4 In 3 5 In 4 6 In 5 7 In 6 8 In 7 9 GND 10 Vcc 11 GND 12 Vcc 13 Out 0 14 Out 1 15 Out 2 16 Out 3 17 Out 4 18 Out 5 19 Out 6 20 Out 7

Table 3 - 2 J5 - Data Pin Signal 1 /RD 2 /WR 3 /SEL 4 Vcc 5 GND 6 Vcc 7 GND 8 A4 9 A3 10 A2 11 A1 12 A0 13 D7 14 D6 15 D5 16 D4 17 D3 18 D2 19 D1 20 D0

Table 3 - 3

J2 (Serial 0) & J3 (Serial 1)
Pin	Signal
1	NC
2	Transmit data
3	Receive data
4	NC
5	GND
6	NC
7	NC
8	NC
9	NC

Memory Map

The memory map of the XA Single Board Computer is shown below. Note that the RAM that appears at 0 in data space is duplicated at 80000 in data and code space. The I/O devices in the space above E0000 are not fully decoded; e.g. accessing any address in the range E0000-E7FFF will access the LED latch.