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4.1
INTRODUCTION
This chapter presents details on core configuration specific to the DSP56309. These
configuration details include the following:
¥ Operating modes
¥ Bootstrap program
¥ Interrupt sources and priorities
¥ DMA request sources
¥ Operating Mode Register
¥ PLL control register
¥ AA control registers
¥ JTAG Boundary Scan Register
For information on specific registers or modules in the DSP56300 core, refer to the
DSP56300 Family Manual (DSP56300FM/AD).
4.2
OPERATING MODES
The DSP56309 begins operation by leaving Reset state and going into one of eight
operating modes. As the DSP56309 exits the Reset state, it loads the values of MODA,
MODB, MODC, and MODD into bits MA, MB, MC, and MD of the Operating Mode
Register (OMR). These bit settings select the operating mode, which determines the
bootstrap program option the microprocessor uses to start up.
The MAÐMD bits of the OMR can also be set directly by software. A jump directly to the
bootstrap program entry point ($FF0000) after the OMR bits are set causes the DSP56309
to execute the specified bootstrap program option (except modes 0 and 8).
Table 4-1 shows the DSP56309 bootstrap operation modes, the corresponding settings of
the external operational mode signal lines (the mode bits MAÐMD in the OMR), and the
reset vector address to which the DSP56309 jumps once it leaves the Reset state.
MOTOROLA
DSP56309UM/D
Core Configuration
Introduction
4-3
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