mc9s12xf512 Freescale Semiconductor, Inc, mc9s12xf512 Datasheet - Page 421
mc9s12xf512
Manufacturer Part Number
mc9s12xf512
Description
S12x Microcontrollers 16-bit Automotive Microcontroller
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC9S12XF512.pdf
(1306 pages)
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11.4
The MMC block performs several basic functions of the S12X sub-system operation: MCU operation
modes, priority control, address mapping, select signal generation and access limitations for the system.
Each aspect is described in the following subsections.
11.4.1
Freescale Semiconductor
•
•
•
Normal single-chip mode
There is no external bus in this mode. The MCU program is executed from the internal memory
and no external accesses are allowed.
Special single-chip mode
This mode is generally used for debugging single-chip operation, boot-strapping or security related
operations. The active background debug mode is in control of the CPU code execution and the
BDM firmware is waiting for serial commands sent through the BKGD pin. There is no external
bus in this mode.
Emulation single-chip mode
Tool vendors use this mode for emulation systems in which the user’s target application is normal
single-chip mode. Code is executed from external or internal memory depending on the set-up of
the EROMON bit (see
is active in both cases to allow observation of internal operations (internal visibility).
Functional Description
MCU Operating Mode
Section 11.3.2.5, “MMC Control Register
MC9S12XF - Family Reference Manual, Rev.1.19
Chapter 11 Memory Mapping Control (S12XMMCV4) SUPPORTING FLEXRAY
(MMCCTL1)). The external bus
421
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