UPSD325X datasheet(31/176 Pages) STMICROELECTRONICS

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µPSD325X DEVICES

µPSD325X HARDWARE DESCRIPTION

The µPSD325X devices have a modular architec-

ture with two main functional modules: the MCU

Module and the PSD Module. The MCU Module

consists of a standard 8032 core, peripherals and

other system supporting functions. The PSD Mod-

ule provides configurable Program and Data mem-

ories to the 8032 CPU core. In addition, it has its

own set of I/O ports and a PLD with 16 macrocells

for general logic implementation. Ports A,B,C, and

D are general purpose programmable I/O ports

that have a port architecture which is different from

Ports 0-4 in the MCU Module.

The PSD Module communicates with the CPU

Core through the internal address, data bus (A0-

A15, D0-D7) and control signals (RD_, WR_,

PSEN_ , ALE, RESET_). The user defines the De-

coding PLD in the PSDsoft Development Tool and

can map the resources in the PSD Module to any

program or data address space.

Figure 15. µPSD325X devices Functional Modules

AI07802

Channel

ADC

1Mb or 2Mb

Main Flash

Decode PLD

256Kb

SRAM

CPLD - 16 MACROCELLS

JTAG ISP

Port 1

Port 3

2 UARTs

Interrupt

3 Timer /

Counters

256 Byte SRAM

8032 Core

Port 3, UART,

Intr, Timers,I2C

PSD Internal Bus

8032 Internal Bus

USB

Transceiver

Port 1, Timers and

2nd UART and ADC

DDC

w/ 256 Byte

SRAM

PWM

Channels

Port 4 PWM

and DDC

Dedicated

USB Pins

Port A & B, PLD

I/O and GPIO

Port D

GPIO

Port C,

JTAG, PLD I/O

and GPIO

VCC, GND,

XTAL

256Kb

Secondary

Flash

Dedicated

Pins

I2C

Port 0, 2

Ext. Bus

Reset Logic

LVD & WDT

Bus

Interface

Reset

D0-D7

A0-A15

RD,PSEN

WR,ALE

Page Register

PSD MODULE

MCU MODULE

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