mc9s12xd256 Freescale Semiconductor, Inc, mc9s12xd256 Datasheet - Page 688

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

Chapter 18 Memory Mapping Control (S12XMMCV3)
18.5.3.3
In normal expanded mode the external bus will be connected to the application. If the ROMON bit is set,
the internal FLASH provides the data. If the ROMON bit is cleared, the application memory provides the
data (see
688
Figure
ROM Control in Normal Expanded Mode
18-29).
MCU
MCU
Figure 18-29. ROM in Normal Expanded Mode
MC9S12XDP512 Data Sheet, Rev. 2.17
Flash
Application
Application
Memory
Memory
ROMON = 1
ROMON = 0
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