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PSD813F2 数据表(PDF) 45 Page - STMicroelectronics |
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PSD813F2 数据表(HTML) 45 Page - STMicroelectronics |
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45 / 128 page  PSD8XXFX Sector Select and SRAM Select Doc ID 7833 Rev 7 45/128 Figure 10. 8031 memory modules – combined space Primary Flash Memory DPLD Secondary Flash Memory SRAM RS0 CSBOOT0-3 FS0-FS7 RD CS CS CS RD OE OE VM REG BIT 2 PSEN VM REG BIT 0 VM REG BIT 1 VM REG BIT 3 VM REG BIT 4 OE AI02870C Table 14. VM register Bit 7 PIO_EN Bit 6 Bit 5 Bit 4 Primary FL_Data Bit 3 econdary EE_Data Bit 2 Primary FL_Code Bit 1 Secondary EE_Code Bit 0 SRAM_Code 0 = disable PIO mode not used not used 0 = RD cannot access Flash memory 0 = RD can’t access secondary Flash memory 0 = PSEN cannot access Flash memory 0 = PSEN can’t access secondary Flash memory 0 = PSEN cannot access SRAM 1= enable PIO mode not used not used 1 = RD access Flash memory 1 = RD access secondary Flash memory 1 = PSEN access Flash memory 1 = PSEN access secondary Flash memory 1 = PSEN access SRAM Obsolete Product(s) - Obsolete Product(s) |
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