PSD311 datasheet(29/85 Pages) STMICROELECTRONICS

Teilenummer	PSD311

Bauteilbeschribung	Low Cost Field Programmable Microcontroller Peripherals

PDF	85 Pages

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Hersteller	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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29 / 85 page

PSD3XX Family

13.0

Program/Data

Space and the

8031

This section only applies to users who have an 8031 or compatible MCU that outputs a

signal such as PSEN when accessing program space. If this applies to you, be aware of the

following:

t The PSD3XX can be configured using PSDsoft such that the EPROM is either

1) accessed by PSEN only (Figure 10); or 2) accessed by PSEN or RD (Figure 9).

The default is PSEN only unless changed in PSDsoft.

t The SRAM and I/O Ports (including CSIOPORT) can not be placed in program space

only. By default, they are in data space only (Figure 10). However, the SRAM may

be placed in Program and Data Space, as shown in Figure 9.

Figure 9. Combined Address Space

INTERNAL

ADDRESS

PSEN

I/O PORTS

PAD

SRAM

EPROM

INTERNAL

ADDRESS

PSEN

I/O PORTS

PAD

SRAM

EPROM

Figure 10. 8031-Compatible Separate Code and Data Address Spaces

*Not available on “R” versions.

PSD311 Datenblatt(PDF) 29 Page - STMicroelectronics