mc9s12xd256 Freescale Semiconductor, Inc, mc9s12xd256 Datasheet - Page 634

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

Chapter 17 Memory Mapping Control (S12XMMCV2)
Expansion of the BDM Local Address Map
PPAGE, RPAGE, and EPAGE registers are also used for the expansion of the BDM local address to the
global address. These registers can be read and written by the BDM.
The BDM expansion scheme is the same as the CPU expansion scheme.
17.4.2.2
CPU Global Addresses Based on the Global Page
The seven global page index bits allow access to the full 8 Mbyte address map that can be accessed with
23 address bits. This provides an alternative way to access all of the various pages of FLASH, RAM and
EEPROM as well as additional external memory.
The GPAGE Register is used only when the CPU is executing a global instruction (see
“Global Page Index Register
the CPU local address [15:0] with the GPAGE register [22:16] (see
BDM Global Addresses Based on the Global Page
The seven BDMGPR Global Page index bits allow access to the full 8 Mbyte address map that can be
accessed with 23 address bits. This provides an alternative way to access all of the various pages of
FLASH, RAM and EEPROM as well as additional external memory.
The BDM global page index register (BDMGPR) is used only in the case the CPU is executing a firmware
command which uses a global instruction (like GLDD, GSTD) or by a BDM hardware command (like
WRITE_W, WRITE_BYTE, READ_W, READ_BYTE). See the BDM Block Guide for further details.
The generated global address is a result of concatenation of the BDM local address with the BDMGPR
register [22:16] in the case of a hardware command or concatenation of the CPU local address and the
BDMGPR register [22:16] in the case of a firmware command (see
634
Global Addresses Based on the Global Page
(GPAGE)”). The generated global address is the result of concatenation of
MC9S12XDP512 Data Sheet, Rev. 2.17
Figure
Figure
1-7).
1-22).
Freescale Semiconductor
Section 1.3.2.3,