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Microprocessor Serial I/O Port Monitor

IP.com Disclosure Number: IPCOM000040628D
Original Publication Date: 1987-Dec-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Carroll, RW: AUTHOR [+4]

Abstract

The Intel 8051 microcomputer has a serial I/O port (UART) that can be used for serially linking multiple 8051's through standard asynchronous protocols with full-duplex operations. The problem is to be able to easily monitor the resulting serial I/O port data traffic when multiple 8051's are linked together in this manner. To achieve such monitoring a special card is provided for the IBM Personal Computer (PC). This card, the Serial Port Adapter Card (SPAC), plugs into an IBM PC and adapts it to the 8051 serial I/O ports. An IBM PC Macro Assembler program, called BUSMON, is written to communicate with the SPAC and to display the serial I/O port traffic on the IBM PC monochrome display.

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Microprocessor Serial I/O Port Monitor

The Intel 8051 microcomputer has a serial I/O port (UART) that can be used for serially linking multiple 8051's through standard asynchronous protocols with full- duplex operations. The problem is to be able to easily monitor the resulting serial I/O port data traffic when multiple 8051's are linked together in this manner. To achieve such monitoring a special card is provided for the IBM Personal Computer (PC). This card, the Serial Port Adapter Card (SPAC), plugs into an IBM PC and adapts it to the 8051 serial I/O ports. An IBM PC Macro Assembler program, called BUSMON, is written to communicate with the SPAC and to display the serial I/O port traffic on the IBM PC monochrome display. The hardware part of the SPAC consists of an Intel 8031 microcomputer (corresponds to an 8051, but without on-chip program memory), a small amount of ROM and RAM, and a few other parts. The 8031 serial I/O port is connected by a cable to the serial I/O ports that are to be monitored. The 8031 and 8051 serial I/O ports are in operating mode 2 with an eleven-bit frame and a fixed transmission rate of 187,500 bits per second. The eleven-bit frame includes one start bit, eight data bits, one address/data bit, and one stop bit. The 8031 communicates with IBM PC 8088 microcomputer using two of the 8088 I/O ports that are mapped onto the RAM of the 8031. This communication is interrupt driven in both directions when receiving data. The software part of the SPAC consists of an 8031 program that resides in ROM. This program receives data from the 8031 serial I/O...