PSD211R datasheet(4/51 Pages) STMICROELECTRONICS

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Introduction

Programmable Peripheral

PSD211R

Field-Programmable Microcontroller Peripheral

The low cost PSD211R family integrates high-performance and user-configurable blocks of

EPROM and programmable logic into one part. The PSD211R products also provide a

powerful microcontroller interface that eliminates the need for external “glue logic”. The

part’s integration, small form factor, low power consumption, and ease of use make it the

ideal part for interfacing to virtually any microcontroller.

The major functional blocks of the PSD211R include:

• Two programmable logic arrays

• 256 Kb of EPROM

• Input latches

• Programmable I/O ports

• Programmable security

The PSD211R family architecture (Figure 1) can efficiently interface with, and enhance,

almost any 8-bit multiplexed microcontroller system. This solution provides microcontrollers

the following:

• Chip-select logic, control logic, and latched address signals that are otherwise

implemented discretely

• Port expansion (reconstructs lost microcontroller I/O)

• An EPROM (with security)

• Compatible with 8031-type architectures that use separate Program and Data Space.

Updated March 1, 1999. See page 47.

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