PSD813F1AV-12MIT datasheet(32/110 Pages) STMICROELECTRONICS

Part #	PSD813F1AV-12MIT

Description	Flash In-System Programmable (ISP) Peripherals for 8-bit MCUs, 3.3V

PDF	110 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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PSD813F1V

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Separate Space Modes

Code memory space is separated from data mem-

ory space. For example, the PSEN signal is used

to access the program code from the Flash Mem-

ory, while the RD signal is used to access data

from the EEPROM, SRAM and I/O Ports. This

configuration requires the VM register to be set to

0Ch. See Figure 12.

Combined Space Modes

The program and data memory spaces are com-

bined into one space that allows the main Flash

Memory, EEPROM, 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” (see Figure

13).

Figure 12. 80C31 Memory Modes - Separate Space

Figure 13. 80C31 Memory Mode - Combined Space

Flash

Memory

DPLD

EEPROM

Memory

SRAM

RS0

EES0-EES3

FS0-FS7

PSEN

AI09222

Flash

Memory

DPLD

EEPROM

Memory

SRAM

RS0

EES0-EES3

FS0-FS7

VM REG BIT 2

PSEN

VM REG BIT 0

VM REG BIT 1

VM REG BIT 3

VM REG BIT 4

AI09223

PSD813F1AV-12MIT Datasheet(PDF) 32 Page - STMicroelectronics

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