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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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HCS08 bảng dữ liệu(PDF) 44 Page - NXP Semiconductors |
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HCS08 bảng dữ liệu(HTML) 44 Page - NXP Semiconductors |
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44 / 374 page  Chapter 4 Memory MC9S08JM60 Series Data Sheet, Rev. 5 44 Freescale Semiconductor — An 8-byte backdoor comparison key which optionally allows a user to gain controlled access to secure memory Because the nonvolatile register locations are flash memory, they must be erased and programmed like other flash memory locations. Direct-page registers can be accessed with efficient direct addressing mode instructions. Bit manipulation instructions can be used to access any bit in any direct-page register. Table 4-2 is a summary of all user-accessible direct-page registers and control bits. The direct page registers in Table 4-2 can use the more efficient direct addressing mode which only requires the lower byte of the address. Because of this, the lower byte of the address in column one is shown in bold text. In Table 4-3 and Table 4-4, the whole address in column one is shown in bold. In Table 4-2, Table 4-3, and Table 4-4, the register names in column two are shown in bold to set them apart from the bit names to the right. Cells that are not associated with named bits are shaded. A shaded cell with a 0 indicates this unused bit always reads as a 0. Shaded cells with dashes indicate unused or reserved bit locations that could read as 1s or 0s. |
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