initial commit

3.md

@@ -0,0 +1,34 @@
+# ARM
+
+ARM based chips
+
+## ARM Processor Architecture
+
+* based on RISC
+  * fixed length inst.
+  * load-store arch
+    * memory-to-register load inst.
+    * register-to-memory store inst.
+  * large uniform register file
+  * 32bit arch(v1-v7), 64bit arch(v8-v9)
+  * good performance/power
+
+## ARM Processor Family
+
+```python { cmd matplotlib hide }
+
+import pymupdf
+
+from PIL import Image
+
+doc = pymupdf.open("./pdf/L3.pdf")
+
+pix = doc[6].get_pixmap()
+img = Image.frombytes("RGB", [pix.width, pix.height], pix.samples)
+plt.axis('off')
+plt.subplots_adjust(left=0, right=1, top=1, bottom=0)
+plt.imshow(img)
+
+plt.show()
+
+```