mc9s12xd256 Freescale Semiconductor, Inc, mc9s12xd256 Datasheet - Page 665

• Manufacturer Part Number: mc9s12xd256
• Description: Hcs12x Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

The reset value of 0xFD ensures that there is a linear RAM space available between addresses 0x1000 and
0x3FFF out of reset.
The fixed 4K page from 0x2000–0x2FFF of RAM is equivalent to page 254 (page number 0xFE).
The fixed 4K page from 0x3000–0x3FFF of RAM is equivalent to page 255 (page number 0xFF).
Freescale Semiconductor
RP[7:0]
Field
7–0
RAM Page Index Bits 7–0 — These page index bits are used to select which of the 256 RAM array pages is to
be accessed in the RAM Page Window.
Because RAM page 0 has the same global address as the register space, it is
possible to write to registers through the RAM space when RPAGE = 0x00.
0
0
0
Figure 18-12. RPAGE Address Mapping
Table 18-12. RPAGE Field Descriptions
Bit19
MC9S12XDP512 Data Sheet, Rev. 2.17
Global Address [22:0]
Bit18
RPAGE Register [7:0]
NOTE
Description
Bit12
Address: CPU Local Address
Chapter 18 Memory Mapping Control (S12XMMCV3)
Bit11
or BDM Local Address
Address [11:0]
Bit0
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