SC312XDP512F0MPVR datasheet(801/1348 Pages) FREESCALE

номер детали	SC312XDP512F0MPVR

подробное описание детали	HCS12X Microcontrollers

PDF	1348 Pages

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производитель	FREESCALE [Freescale Semiconductor, Inc]

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Chapter 21 External Bus Interface (S12XEBIV2)

MC9S12XDP512 Data Sheet, Rev. 2.21

Freescale Semiconductor

803

21.5.2

Emulation Modes

In emulation mode applications, the development systems use a custom PRU device to rebuild the

single-chip or expanded bus functions which are lost due to the use of the external bus with an emulator.

Accesses to a set of registers controlling the related ports in normal modes (refer to SoC section) are

directed to the external bus in emulation modes which are substituted by PRR as part of the PRU. Accesses

to these registers take a constant time of 2 cycles.

Depending on the setting of ROMON and EROMON (refer to S12X_MMC section), the program code

can be executed from internal memory or an optional external emulation memory (EMULMEM). No wait

state operation (stretching) of the external bus access is done in emulation modes when accessing internal

memory or emulation memory addresses.

In both modes observation of the internal operation is supported through the external bus (internal

visibility).

SC312XDP512F0MPVR датащи(PDF) 801 Page - Freescale Semiconductor, Inc