
MOTOROLA
MC68SC302 USER’S MANUAL
v
TABLE OF CONTENTS
Paragraph
Number
Title
Page
Number
PREFACE
ELECTRONIC SUPPORT:.........................................................................iii
— Sales Offices —.....................................................................................iii
Section 1
MC68SC302 Overview
1.1
1.2
1.3
1.4
1.5
MC68SC302 Key Features..................................................................... 1-1
MC68SC302 Overview............................................................................ 1-4
Reference Designs.................................................................................. 1-5
MC68SC302 Application Development System...................................... 1-7
ADS Features.......................................................................................... 1-7
Section 2
Signal Description and Pin Control
Host Interface Pins – ISA Mode.............................................................. 2-3
Address Bus Pins.................................................................................... 2-4
Latched Address Bus Pins (LA23—LA17).............................................. 2-4
Static Address Bus Pins (SA16—SA0)................................................... 2-4
Data Bus Pins (SD15—SD0) .................................................................. 2-4
Low Data Bus Pins (SD7–SD0) .............................................................. 2-4
High Data Bus Pins (SD15—SD8).......................................................... 2-4
Bus Control Pins ..................................................................................... 2-4
AEN—Address Enable pin...................................................................... 2-4
BALE—Bus Address Latch Enable......................................................... 2-4
SBHE—System Bus High Enable........................................................... 2-4
MEMR—Memory Read........................................................................... 2-5
MEMW—Memory Write .......................................................................... 2-5
IOR—I/O Read........................................................................................ 2-5
IOW/PC_Mode—I/O Write and PC_Mode.............................................. 2-5
MEMCS16—Memory Cycle Select is 16 Bit ........................................... 2-5
IOCS16—I/O Cycle Select is 16 Bi......................................................... 2-5
IOCHRDY—I/O Channel Ready ............................................................. 2-5
REF—Refresh......................................................................................... 2-5
RESET — Reset..................................................................................... 2-5
Interrupt Out Pins.................................................................................... 2-6
IRQ9, 10, 11, 12, 15 — Dedicated mode................................................ 2-6
IRQO, IRQSEL3–IRQSEL0 — Encoded Mode....................................... 2-6
Clock Pins............................................................................................... 2-6
2.1
2.1.1
2.1.1.1
2.1.1.2
2.1.2
2.1.2.1
2.1.2.2
2.1.3
2.1.3.1
2.1.3.2
2.1.3.3
2.1.3.4
2.1.3.5
2.1.3.6
2.1.3.7
2.1.3.8
2.1.3.9
2.1.3.10
2.1.3.11
2.1.3.12
2.1.4
2.1.4.1
2.1.4.2
2.1.5