PSD833F3A-20UI View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
PSD833F3A-20UI Datasheet PDF : 128 Pages
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PSD8XXFX
Figure 10. 8031 memory modules – combined space
Sector Select and SRAM Select
DPLD
RS0
Primary
Flash
Secondary
Flash
SRAM
Memory
Memory
RD
CSBOOT0-3
FS0-FS7
CS
OE
CS
OE
CS
OE
VM REG BIT 3
VM REG BIT 4
t(s) PSEN
c VM REG BIT 1
rodu VM REG BIT 2
RD
te P VM REG BIT 0
AI02870C
sole Table 14. VM register
Ob Bit 7
Bit 6 Bit 5
- PIO_EN
Bit 4
Primary
FL_Data
Bit 3
econdary
EE_Data
Bit 2
Primary
FL_Code
Bit 1
Secondary
EE_Code
Bit 0
SRAM_Code
ct(s) 0 = disable not
du PIO mode used
te Pro 1= enable not
Obsole PIO mode used
not
used
not
used
0 = RD
cannot access
Flash memory
0 = RD can’t
access
secondary Flash
memory
1 = RD
access Flash
memory
1 = RD access
secondary Flash
memory
0 = PSEN
cannot
access
Flash
memory
1 = PSEN
access
Flash
memory
0 = PSEN can’t
access
secondary Flash
memory
1 = PSEN access
secondary Flash
memory
0 = PSEN
cannot
access
SRAM
1 = PSEN
access
SRAM
Doc ID 7833 Rev 7
45/128
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