ZPSD311V-B-20UI View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
ZPSD311V-B-20UI Datasheet PDF : 85 Pages
| |||
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
t(s) ADDRESS
Product(s) INTERNAL RD
lete uc PSEN
t(s) - Obssoolete Prod *Not available on “R” versions.
PAD
CS
SRAM*
OE
CS OE
I/O PORTS
OE
EPROM
CS
roduc - Ob Figure 10. 8031-Compatible Separate Code and Data Address Spaces
solete Product(s)INTERNALRD
I/O PORTS
OE
CS
OObbsolete P ADDRESS
PAD
OE
CS
SRAM*
CS
PSEN
EPROM
OE
*Not available on “R” versions.
26
Share Link: 