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UPSD3212A-24T6T

Flash Programmable System Devices with 8032 MCU with USB and Programmable Logic

STMicroelectronics 

ARCHITECTURE OVERVIEW

Memory Organization

The uPSD321x Devices’s standard 8032 Core has

separate 64KB address spaces for Program mem-

ory and Data Memory. Program memory is where

the 8032 executes instructions from. Data memory

is used to hold data variables. Flash memory can

be mapped in either program or data space. The

Flash memory consists of two flash memory

blocks: the main Flash (512Kbit) and the Second-

ary Flash (128Kbit). Except during flash memory

programming or update, Flash memory can only

be read, not written to. A Page Register is used to

access memory beyond the 64K bytes address

Figure 5. Memory Map and Address Space

uPSD3212A, uPSD3212C, uPSD3212CV

space. Refer to the PSD Module for details on

mapping of the Flash memory.

The 8032 core has two types of data memory (in-

ternal and external) that can be read and written.

The internal SRAM consists of 256 bytes, and in-

cludes the stack area.

The SFR (Special Function Registers) occupies

the upper 128 bytes of the internal SRAM, the reg-

isters can be accessed by Direct addressing only.

Another 2K bytes resides in the PSD Module that

can be mapped to any address space defined by

the user.

MAIN

FLASH

EXT. RAM

SECONDARY

FLASH

64KB

16KB

Flash Memory Space

INT. RAM

FF

Indirect

Addressing

SFR

Direct

Addressing

7F

Indirect

or

Direct

Addressing

0

Internal RAM Space

(256 Bytes)

2KB

External RAM Space

(MOVX)

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