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PSD4235G2 bảng dữ liệu(PDF) 30 Page - STMicroelectronics |
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PSD4235G2 bảng dữ liệu(HTML) 30 Page - STMicroelectronics |
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30 / 89 page ![]() PSD4235G2 30/89 Figure 10. 8031 Memory Modules – Combined Space Page Register The 8-bit Page Register increases the addressing capability of the MCU by a factor of up to 256. The contents of the register can also be read by the MCU. The outputs of the Page Register (PGR0- PGR7) are inputs to the DPLD decoder and can be included in the Sector Select (FS0-FS7, CSBOOT0-CSBOOT3), and SRAM Select (RS0) equations. If memory paging is not needed, or if not all eight page register bits are needed for memory paging, these bits may be used in the CPLD for general logic. See Application Note AN1154. Table 22 and Figure 11 show the Page Register. The eight flip-flops in the register are connected to the internal data bus (D0-D7). The MCU can write to or read from the Page Register. The Page Reg- ister can be accessed at address location CSIOP + E0h. Figure 11. Page Register 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 RESET D 0-D 7 R/W D0 Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 D1 D2 D3 D4 D5 D6 D7 PAGE REGISTER PGR0 PGR1 PGR2 PGR3 DPLD AND CPLD INTERNAL SELECTS AND LOGIC PLD PGR4 PGR5 PGR6 PGR7 AI02871B |
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