ZPSD211R-B-15J STMICROELECTRONICS [STMicroelectronics], ZPSD211R-B-15J Datasheet - Page 23

• Manufacturer Part Number: ZPSD211R-B-15J
• Description: Low Cost Field Programmable Microcontroller Peripherals
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

13.0
Program/Data
Space and the
8031
20
PSD211R Family
Figure 10. 8031-Compatible Separate Code and Data Address Spaces
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: the PSD211R 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.
Figure 9. Combined Address Space
ADDRESS
INTERNAL
PSEN
INTERNAL
ADDRESS
PSEN
RD
RD
OE
I/O PORTS
PAD
CS
PAD
I/O PORTS
CS
OE
CS
OE
CS
EPROM
OE
EPROM