uPSD3234A, uPSD3234BV, uPSD3233B, uPSD3233BV
SUMMARY DESCRIPTION
The uPSD323x Series combines a fast 8051-
based microcontroller with a flexible memory
structure, programmable logic, and a rich periph-
eral mix including USB, to form an ideal embedded
controller. At its core is an industry-standard 8032
MCU operating up to 40MHz.
A JTAG serial interface is used for In-System Pro-
gramming (ISP) in as little as 10 seconds, perfect
for manufacturing and lab development.
The USB 1.1 low-speed interface has one Control
endpoint and two Interrupt endpoints suitable for
HID class drivers.
The 8032 core is coupled to Programmable Sys-
tem Device (PSD) architecture to optimize the
8032 memory structure, offering two independent
banks of Flash memory that can be placed at vir-
tually any address within 8032 program or data ad-
dress space, and easily paged beyond 64K bytes
using on-chip programmable decode logic.
Figure 2. Block Diagram
uPSD323x
(3) 16-bit
Timer/
Counters
(2)
External
Interrupts
8032
MCU
Core
Dual Flash memory banks provide a robust solu-
tion for remote product updates in the field through
In-Application Programming (IAP). Dual Flash
banks also support EEPROM emulation, eliminat-
ing the need for external EEPROM chips.
General purpose programmable logic (PLD) is in-
cluded to build an endless variety of glue-logic,
saving external logic devices. The PLD is config-
ured using the software development tool, PSD-
soft Express, available from the web at
www.st.com/psm,
at no charge.
The uPSD323x also includes supervisor functions
such as a programmable watchdog timer and low-
voltage reset.
1st Flash Memory:
128K or 256K Bytes
Programmable
Decode and
Page Logic
P3.0:7
I C
2
2nd Flash Memory:
32K Bytes
SRAM:
8K Bytes
UART0
(8) GPIO, Port A
(80-pin only)
PA0:7
PB0:7
PD1:2
SYSTEM BUS
(8) GPIO, Port 3
P1.0:7
(8) GPIO, Port 1
General
Purpose
Programmable
Logic,
16 Macrocells
(8) GPIO, Port B
(2) GPIO, Port D
(4) GPIO, Port C
(4) 8-bit ADC
PC0:7
UART1
JTAG ISP
8032 Address/Data/Control Bus
(80-pin device only)
Supervisor:
Watchdog and Low-Voltage Reset
V
CC
, V
DD
, GND, Reset, Crystal In
(5) 8-bit PWM
MCU
Bus
P4.0:7
USB+,
USB–
(8) GPIO, Port 4
USB v1.1
Dedicated
Pins
AI10429
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