dsp56800e Freescale Semiconductor, Inc, dsp56800e Datasheet - Page 48

• Manufacturer Part Number: dsp56800e
• Description: 16-bit Digital Signal Controller Core
• Manufacturer: Freescale Semiconductor, Inc

Core Architecture Overview
in the loop is pushed onto the hardware stack. When a loop finishes normally or an ENDDO instruction is
encountered, the value is popped from the hardware stack. This process allows for one hardware DO loop
to be nested inside another.
The program controller is described in more detail in Chapter 8, “Program Controller.” For more
information on hardware looping, see Section 8.5, “Hardware Looping,” on page 8-18. Information on
interrupt processing is contained in Chapter 9, “Processing States.”
2.4.7
The bit-manipulation unit performs bitfield operations on data memory words, peripheral registers, and
registers within the DSP56800E core. It is capable of testing, setting, clearing, or inverting individual or
multiple bits within a 16-bit word. The bit-manipulation unit can also test bytes for branch-on-bitfield
instructions.
See Chapter 7, “Bit-Manipulation Unit,” for a detailed description of the bitfield unit.
2.4.8
The Enhanced On-Chip Emulation (Enhanced OnCE) unit provides a non-intrusive debugging
environment. It is capable of examining and changing core or peripheral registers and memory values. It
can also be used to set breakpoints in program or data memory and step or trace instruction execution.
Refer to Chapter 11, “JTAG and Enhanced On-Chip Emulation (Enhanced OnCE),” for an overview of the
Enhanced OnCE unit’s capabilities.
2.5
Devices based on the DSP56800E core contain several additional memory and peripheral blocks. These
blocks provide the functionality that is necessary for a complete working system on a chip. Typical blocks
include those outlined in the following subsections.
2-10
Blocks Outside the DSP56800E Core
Bit-Manipulation Unit
Enhanced On-Chip Emulation (Enhanced OnCE) Unit
DSP56800E Core Reference Manual
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