PSD501B1 datasheet(4/153 Pages) STMICROELECTRONICS

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Introduction

Programmable Peripheral

PSD5XX Family

Field-Programmable Microcontroller Peripherals

The PSD5XX family is a microcontroller peripheral that integrates high-performance and

user-configurable blocks of EPROM, programmable logic, and SRAM into one part. The

PSD5XX is also loaded with a variety of features, such as Counter/Timers, Interrupt

controller, power management, and page logic. The PSD5XX products also provide a

powerful microcontroller interface that eliminates the need for external “glue logic”. The no

“glue logic” concept provides a user-programmable interface to a variety of 8- and 16-bit

(multiplexed or non-multiplexed) microcontrollers that is easy to use. 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 PSD5XX provides three Zero-power PLDs (ZPLDs): a Decode PLD (DPLD), a

General-purpose PLD (PLD), and a Peripheral PLD (PPLD). The ZPLDs have a total of 61

inputs, 140 product terms, 30 macrocells, and 24 I/O connections. A configuration bit

(Turbo) can be set by the MCU, and will automatically place the ZPLDs into standby if

no inputs are changing. The ZPLDs are designed to consume minimum power using Zero

Power CMOS technology that uses low standby current. Unused product terms are

automatically disabled, also reducing power, regardless of the Turbo bit setting.

The main function of the DPLD is to perform address decoding for the internal I/O ports,

EPROM, and SRAM. The address decoding can be based on up to 24 bits of address

inputs, control signals (RD, WR, PSEN, etc.), and internal page logic. The DPLD supports

separate program and data spaces (for 8031 compatible MCUs).

The General-purpose PLD (GPLD) can be used to implement various logic defined by the

user, such as:

• State machines

• Loadable counters and shift registers

• Inter-processor mailbox

• External control logic (chip selects, output enables, etc.).

The GPLD has access to up to 61 inputs, 118 product terms, 24 macrocells, and 24 I/O

pins.

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