S912XHZ512F1VAG Datasheet, PDF (887/978 Pages) Freescale Semiconductor, Inc – Covers MC9S12XHZ384, MC9S12XHZ256

Chapter 25 Memory Mapping Control (S12XMMCV3)
25.5.3.3 ROM Control in Normal Expanded Mode
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 Figure 25-29).
MCU
Application
Flash
MCU
Memory
ROMON = 1
Application
Memory
ROMON = 0
Figure 25-29. ROM in Normal Expanded Mode
MC9S12XHZ512 Data Sheet, Rev. 1.06
Freescale Semiconductor
887