From a000308104aab27c2dde9a306f1bc654b2db4806 Mon Sep 17 00:00:00 2001
From: Yuchen Pei <me@ypei.me>
Date: Wed, 29 Nov 2017 12:30:41 +0100
Subject: first commit

---
 tools/builtInChips/PC.hdl | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100644 tools/builtInChips/PC.hdl

(limited to 'tools/builtInChips/PC.hdl')

diff --git a/tools/builtInChips/PC.hdl b/tools/builtInChips/PC.hdl
new file mode 100644
index 0000000..f102d99
--- /dev/null
+++ b/tools/builtInChips/PC.hdl
@@ -0,0 +1,22 @@
+// This file is part of www.nand2tetris.org
+// and the book "The Elements of Computing Systems"
+// by Nisan and Schocken, MIT Press.
+// File name: tools/builtIn/PC.hdl
+
+/**
+ * 16-bit counter with load and reset controls.
+ *
+ * If reset(t-1) then out(t) = 0
+ *    else if load(t-1) then out(t) = in(t-1)
+ *         else if inc(t-1) then out(t) = out(t-1) + 1 (integer addition)
+ *              else out(t) = out(t-1)
+ */
+
+CHIP PC {
+
+    IN  in[16], load, inc, reset;
+    OUT out[16];
+
+    BUILTIN PC;
+    CLOCKED in, load, inc, reset;
+}
-- 
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