Datasheet

Chapter 18 Memory Mapping Control (S12XMMCV3)
MC9S12XDP512 Data Sheet, Rev. 2.21
Freescale Semiconductor 689
Figure 18-31. ROMON = 0 in Emulation Expanded Mode
18.5.3.5 ROM Control in Special Test Mode
In special test mode the external bus is connected to the application. If the ROMON bit is set, the internal
FLASH provides the data, otherwise the application memory provides the data (see Figure 18-32).
Figure 18-32. ROM in Special Test Mode
Application
MCU
Memory
Emulator
Observer
Application
MCU
Memory
ROMON = 0
Application
MCU
Memory
ROMON = 1
Flash