November 1991

Order Number 290256-001

8742

UNIVERSAL PERIPHERAL INTERFACE

8-BIT SLAVE MICROCONTROLLER

Y

8742 12 MHz

Y

Pin Software and Architecturally

Compatible with 8741A

Y

8-Bit CPU plus ROM RAM IO Timer

and Clock in a Single Package

Y

2048x8EPROM 128x8 RAM 8-Bit

TimerCounter 18 Programmable IO

Pins

Y

One 8-Bit Status and Two Data

Registers for Asynchronous Slave-to-

Master Interface

Y

DMA Interrupt or Polled Operation

Supported

Y

Fully Compatible with all Intel and Most

Other Microprocessor Families

Y

Expandable IO

Y

RAM Power-Down Capability

Y

Over 90 Instructions 70% Single Byte

Y

Available in EXPRESS

Standard Temperature Range

The Intel 8742 is a general-purpose Universal Peripheral Interface that allows designers to grow their own

customized solution for peripheral device control It contains a low-cost microcomputer with 2K of program

memory 128 bytes of data memory 8-bit timercounter and clock generator in a single 40-pin package

Interface registers are included to enable the UPI device to function as a peripheral controller in the MCS -48

MCS-51 MCS-80 MCS-85 8088 8086 and other 8- 16-bit systems

The 8742 is software pin and architecturally compatible with the 8741A The 8742 doubles the on-chip

memory space to allow for additional features and performance to be incorporated in upgraded 8741A de-

signs For new designs the additional memory and performance of the 8742 extends the UPI concept to more

complex motor control tasks 80-column printers and process control applications as examples

290256 – 2

Figure 1 Pin Configuration

1