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Chapter 4 Memory

MC9S08JM60 Series Data Sheet, Rev. 5

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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