What is On-chip debugging? How it is accessed?

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written 5.7 years ago by

hetalgosavi • 1.6k

Advances in semiconductor Technology has brought out new dimensions to fire ware debugging.
Most of the processes/ controllers incorporate built in debug modules called on chip debugging support.
Though OCD adds silicone complexity and cost factor, from a developer perspective it is a good feature supporting fast and efficient firmware debugging.
On chip Debugging facilities that are integrated to microprocessor/ microcontroller are chip vendor dependent.
They could be added through JTAG port.
Microprocessor/ microcontroller with OCD support incorporate dedicated debug module to existing architecture.
OCD- provides means to set simple breakpoints, query external state of chip, single step through code.
OCD module- implements dedicated register for controlling debugging.
Enabled using enable bit pin.

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