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Bachelor's Degree in Telecommunications Systems and in Network Engineering |
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Power-ON reset of sequential systems and microcontrollers |
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Clear direct (CD), master reset (MCRL)
The idea of initialising a sequential system to a known state
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Fig. 1. Waveforms. |
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Fig. 2. Example of typical external MCLR_L circuit (CD_L) in PIC EXPLORER 8 development kit schematic. R18·C18 is the circuit time contant. R23 is intended for pin protection. |
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Fig. 3. Reset circuit block diagram from PIC18F4520 internal architecture. MCLR_L pushbutton does the same function than the RESET assembler instruction. See circuit's datasheet chapter 4 to read about the various kinds of reset options. |
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