CONTENTS PAGE
1.0 INTRODUCTION? 1
1.1 System Overview? 2
1.2 Application Examples? 2H
2.0 OVERVIEW OF THE 80186, 80C51,
8052, AND 8044? 2
2.1 The 80186 Internal Architecture? 2
2.2 The MCS-51 Internal Architecture? 3
2.3 The 8044 Internal Architecture? 3
3.0 80186/MICROCONTROLLER
INTERACTION? 4
4.0 SYSTEM INTERFACE? 5
4.1 Command/Status Transfers? 5
4.2 Data/Parameter Transfer? 5
4.3 Interrupts 6
5.0 COMMAND AND STATUS? 7
5.1 Commands? 7
5.1.1 Acknowledging Interrupt? 7
5.1.2 Operations? 7
5.1.3 Illegal Commands? 9
5.2 Status 9
5.2.1 Interrupt? 9
5.2.2 DMA Operation? 9
5.2.3 Error 9
5.2.4 Request to Send? 9
5.2.5 Clear to Send? 9
5.2.6 Event? 9
6.0 HARDWARE DESCRIPTION? 10
6.1 Reset 10
6.2 Sending Commands? 10
6.3 DMA Transfers? 11
6.4 Reading Status? 11
CONTENTS PAGEH
7.0 80186/8044 INTERFACE? 12
7.1 Configuring the 8044? 12
7.2 Transferring a Message with the
8044 13
7.3 Receiving a Message with the
8044 13
7.4 Dumping the 8044 Registers? 14
7.5 Aborting an Operation? 14
7.6 Disabling Transmission or
Reception? 14
7.7 Handling Interrupts? 15
CONTENTS PAGE
8.0 8044 IN EXPANDED OPERATION? 15
8.1 Transmitting a Message in Expanded
Operation 15
8.2 Receiving a Message in Expanded
Operation 15
9.0 CONCLUSION? 15
APPENDIX A: SOFTWARE? A-1