PSD934210MIT datasheet(25/89 Pages) STMICROELECTRONICS

Part #	PSD934210MIT

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

PDF	89 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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PSD834F2V

Configuration Modes for MCUs with Separate

Program and Data Spaces. Separate

Space

Modes. Program space is separated from Data

space. For example, Program Select Enable

(PSEN, CNTL2) is used to access the program

code from the primary Flash memory, while Read

Strobe (RD, CNTL1) is used to access data from

the secondary Flash memory, SRAM and I/O Port

blocks. This configuration requires the VM register

to be set to 0Ch (see Figure 7).

Figure 7. 8031 Memory Modules – Separate Space

Combined Space Modes. The

Program

and

Data spaces are combined into one memory

space that allows the primary Flash memory, sec-

ondary Flash memory, and SRAM to be accessed

by either Program Select Enable (PSEN, CNTL2)

or Read Strobe (RD, CNTL1). For example, to

configure the primary Flash memory in Combined

space, bits b2 and b4 of the VM register are set to

1 (see Figure 8).

Figure 8. 8031 Memory Modules – Combined Space

Primary

Flash

Memory

DPLD

Secondary

Flash

Memory

SRAM

RS0

CSBOOT0-3

FS0-FS7

PSEN

AI02869C

Primary

Flash

Memory

DPLD

Secondary

Flash

Memory

SRAM

RS0

CSBOOT0-3

FS0-FS7

VM REG BIT 2

PSEN

VM REG BIT 0

VM REG BIT 1

VM REG BIT 3

VM REG BIT 4

AI02870C

PSD934210MIT Datasheet(PDF) 25 Page - STMicroelectronics

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