PSD4235G2 datasheet(31/93 Pages) STMICROELECTRONICS

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The

PSD4000

Functional

Blocks

(cont.)

MAIN

FLASH

DPLD

FLASH

BOOT

BLOCK

SRAM

RS0

CSBOOT0-3

FS0-7

PSEN

Figure 6. 80C51XA Memory Modes – Separate Space Mode

MAIN

FLASH

DPLD

FLASH

BOOT

BLOCK

SRAM

RS0

CSBOOT0-3

FS0-7

VM REG BIT 2

PSEN

VM REG BIT 0

VM REG BIT 1

VM REG BIT 3

VM REG BIT 4

Figure 7. 80C51XA Memory Mode – Combined Space Mode

9.1.3.2 Configuration Modes for MCUs with Separate Program and Data Spaces

9.1.3.2.1 Separate Space Modes

Code memory space is separated from data memory space. For example, the PSEN

signal is used to access the program code from the main Flash Memory, while the RD

signal is used to access data from the secondary Flash memory, SRAM and I/O Ports.

This configuration requires the VM register to be set to 0Ch.

9.1.3.2.2 . Combined Space Modes

The program and data memory spaces are combined into one space that allows the main

Flash Memory, secondary Flash memory, and SRAM to be accessed by either PSEN or

RD. For example, to configure the main Flash memory in combined space mode, bits 2

and 4 of the VM register are set to “1”.

9.1.3.3 80C51XA Memory Map Example

See Application Notes for examples.

PSD4000 Series

Preliminary Information

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