PSD834F2-10J 查看數據表（PDF） - STMicroelectronics

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PSD834F2-10J

Flash PSD, 3.3V Supply, for 8-bit MCUs 2 Mbit + 256 Kbit Dual Flash Memories and 64 Kbit SRAM

STMicroelectronics 

PSD834F2V

SUMMARY DESCRIPTION

The PSD family of memory systems for microcon- – First-time In-System Programming (ISP)

trollers (MCUs) brings In-System-Programmability

(ISP) to Flash memory and programmable logic.

The result is a simple and flexible solution for em-

bedded designs. PSD devices combine many of

– Complex address decoding

– Simulataneous READ and WRITE to the

device.

the peripheral functions found in MCU based ap- The JTAG Serial Interface block allows In-System

plications.

Programming (ISP), and eliminates the need for

The CPLD in the PSD devices features an opti-

mized macrocell logic architecture. The PSD mac-

rocell was created to address the unique

requirements of embedded system designs. It al-

lows direct connection between the system ad-

dress/data bus, and the internal PSD registers, to

simplify communication between the MCU and

an external Boot EPROM, or an external program-

mer. To simplify Flash memory updates, program

execution is performed from a secondary Flash

memory while the primary Flash memory is being

updated. This solution avoids the complicated

hardware and software overhead necessary to im-

plement IAP.

other supporting devices.

ST makes available a software development tool,

The PSD device includes a JTAG Serial Program-

ming interface, to allow In-System Programming

(ISP) of the entire device. This feature reduces de-

velopment time, simplifies the manufacturing flow,

t(s) and dramatically lowers the cost of field upgrades.

Using ST’s special Fast-JTAG programming, a de-

c sign can be rapidly programmed into the PSD in as

u little as seven seconds.

d The innovative PSD family solves key problems

ro faced by designers when managing discrete Flash

Obsolete Product(s) - Obsolete P memory devices, such as:

PSDsoft Express, that generates ANSI-C compli-

ant code for use with your target MCU. This code

allows you to manipulate the non-volatile memory

(NVM) within the PSD. Code examples are also

provided for:

– Flash memory IAP via the UART of the host

MCU

– Memory paging to execute code across several

PSD memory pages

– Loading, reading, and manipulation of PSD

macrocells by the MCU.

5/95

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