Table of Contents
Paragraph
Number
Title
Page
Number
MOTOROLA
MC68302 USER’S MANUAL
xi
5.6
5.7
5.8
5.9
5.10
5.11
5.12
5.13
5.14
5.15
5.16
5.17
5.18
5.19
5.20
5.21
5.22
Data Bus Pins (D15—D0) ....................................................................... 5-7
Bus Control Pins...................................................................................... 5-8
Bus Arbitration Pins............................................................................... 5-10
Interrupt Control Pins ............................................................................ 5-11
MC68302 Bus Interface Signal Summary............................................. 5-12
Physical Layer Serial Interface Pins...................................................... 5-13
Typical Serial Interface Pin Configurations ........................................... 5-14
NMSI1 or ISDN Interface Pins............................................................... 5-14
NMSI2 Port or Port a Pins..................................................................... 5-17
NMSI3 Port or Port A Pins or SCP Pins................................................ 5-18
IDMA or Port A Pins.............................................................................. 5-19
IACK or PIO Port B Pins........................................................................ 5-20
Timer Pins............................................................................................. 5-20
Parallel I/O Pins with Interrupt Capability.............................................. 5-22
Chip-Select Pins.................................................................................... 5-22
No-Connect Pins................................................................................... 5-23
When to Use Pullup Resistors............................................................... 5-23
Section 6
Electrical Characteristics
6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8
6.9
6.10
Maximum Ratings.................................................................................... 6-1
Thermal Characteristics .......................................................................... 6-1
Power Considerations............................................................................. 6-2
Power Dissipation.................................................................................... 6-3
DC Electrical Characteristics................................................................... 6-4
DC Electrical Characteristics—NMSI1 in IDL Mode................................ 6-5
AC Electrical Specifications—Clock Timing............................................ 6-5
AC Electrical Specifications—IMP Bus Master Cycles............................ 6-6
AC Electrical Specifications—DMA....................................................... 6-13
AC Electrical Specifications—External Master
Internal Asynchronous Read/Write Cycles............................................ 6-16
AC Electrical Specifications—External Master Internal Synchronous
Read/Write Cycles................................................................................. 6-19
AC Electrical Specifications—Internal Master
Internal Read/Write Cycles.................................................................... 6-23
AC Electrical Specifications—Chip-Select Timing Internal
Master .................................................................................................. 6-24
AC Electrical Specifications—Chip-Select Timing External Master ...... 6-25
AC Electrical Specifications—Parallel I/O ............................................ 6-26
AC Electrical Specifications—Interrupts................................................ 6-27
AC Electrical Specifications—Timers.................................................... 6-28
AC Electrical Specifications—Serial Communications Port . ................ 6-29
AC Electrical Specifications—IDL Timing.............................................. 6-30
AC Electrical Specifications—GCI Timing............................................. 6-32
AC Electrical Specifications—PCM Timing........................................... 6-34
AC Electrical Specifications—NMSI Timing.......................................... 6-36
6.11
6.12
6.13
6.14
6.15
6.16
6.17
6.18
6.19
6.20
6.21
6.22