MC68HC912BD32 Datasheet, PDF (235/292 Pages) Freescale Semiconductor, Inc – Advance Information

Freescale Semiconductor, Inc.
Development Support
Development Support
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 231
Instruction Queue . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 231
Background Debug Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 233
Breakpoints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 247
Instruction Tagging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 253
Introduction
Development support involves complex interactions between
MC68HC912BD32 resources and external development systems. The
following section concerns instruction queue and queue tracking signals,
background debug mode, and instruction tagging.
Instruction Queue
The CPU12 instruction queue provides at least three bytes of program
information to the CPU when instruction execution begins. The CPU12
always completely finishes executing an instruction before beginning to
execute the next instruction. Status signals IPIPE[1:0] provide
information about data movement in the queue and indicate when the
CPU begins to execute instructions. This makes it possible to monitor
CPU activity on a cycle-by-cycle basis for debugging. Information
available on the IPIPE[1:0] pins is time multiplexed. External circuitry
can latch data movement information on rising edges of the E-clock
signal; execution start information can be latched on falling edges.
Table 55 shows the meaning of data on the pins.
1-dev
Development Support
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MC68HC912BD32 Rev 1.0