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22 lines
620 B
Plaintext
22 lines
620 B
Plaintext
// This file is part of www.nand2tetris.org
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// and the book "The Elements of Computing Systems"
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// by Nisan and Schocken, MIT Press.
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// File name: projects/3/a/PC.hdl
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/**
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* A 16-bit counter.
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* if reset(t): out(t+1) = 0
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* else if load(t): out(t+1) = in(t)
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* else if inc(t): out(t+1) = out(t) + 1
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* else out(t+1) = out(t)
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*/
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CHIP PC {
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IN in[16], reset, load, inc;
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OUT out[16];
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PARTS:
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Inc16(in=r, out=i);
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Mux16(a=r, b=i, sel=inc, out=oi);
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Mux16(a=oi, b=in, sel=load, out=ol);
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Mux16(a=ol, b=false, sel=reset, out=or);
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Register(in=or, load=true, out=r, out=out);
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} |