psd813f3 STMicroelectronics, psd813f3 Datasheet - Page 31

• Manufacturer Part Number: psd813f3
• Description: Flash In-system Programmable Isp Peripherals For 8-bit Mcus
• Manufacturer: STMicroelectronics

Figure 10. 8031 Memory Modules – Separate Space
Figure 11. 8031 Memory Modules – Combined Space
Table 13. VM Register
0 = disable
PIO mode
PIO mode
1= enable
PIO_EN
Bit 7
RD
PSEN
VM REG BIT 3
VM REG BIT 4
VM REG BIT 1
VM REG BIT 2
VM REG BIT 0
Bit 6
used
used
not
not
DPLD
Bit 5
used
used
not
not
RD
RS0
CSBOOT0-3
FS0-FS7
PSEN
DPLD
Flash memory
access Flash
can’t access
FL_Data
Primary
memory
0 = RD
1 = RD
Bit 4
RS0
CSBOOT0-3
FS0-FS7
PSD813F2, PSD833F2, PSD834F2, PSD853F2, PSD854F2
CS
Secondary Flash
Secondary Flash
Memory
Primary
1 = RD access
Flash
OE
0 = RD can’t
Secondary
EE_Data
memory
memory
access
Bit 3
CS
Primary
Memory
Flash
OE
Secondary
CS
can’t access
Memory
0 = PSEN
1 = PSEN
FL_Code
Flash
Primary
OE
memory
memory
access
Flash
Flash
Bit 2
RD
Secondary
CS
Memory
Flash
1 = PSEN access
OE
Secondary Flash
Secondary Flash
0 = PSEN can’t
Secondary
EE_Code
CS
memory
memory
access
SRAM
Bit 1
OE
CS
SRAM
OE
SRAM_Code
can’t access
AI02870C
0 = PSEN
1 = PSEN
AI02869C
access
SRAM
SRAM
Bit 0
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