Created
April 28, 2015 22:58
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// This file is part of www.nand2tetris.org | |
// and the book "The Elements of Computing Systems" | |
// by Nisan and Schocken, MIT Press. | |
// File name: projects/03/a/PC.hdl | |
/** | |
* A 16-bit counter with load and reset control bits. | |
* if (reset[t] == 1) out[t+1] = 0 | |
* else if (load[t] == 1) out[t+1] = in[t] | |
* else if (inc[t] == 1) out[t+1] = out[t] + 1 (integer addition) | |
* else out[t+1] = out[t] | |
*/ | |
CHIP PC { | |
IN in[16],load,inc,reset; | |
OUT out[16]; | |
PARTS: | |
Inc16(in=out1,out=out2); | |
Mux16(a=out1,b=out2,sel=inc,out=out3); | |
Mux16(a=out3,b=in,sel=load,out=out4); | |
Mux16(a=out4,b=false,sel=reset,out=out5); | |
Register(in=out5,load=true,out=out1,out=out); | |
} |
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