UPSD3212A Datasheet, PDF (13/163 Pages) STMicroelectronics – Flash Programmable System Devices with 8032 MCU with USB and Programmable Logic

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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