Update README.md

2019-05-08 08:26:57 +03:00 · 2019-05-08 08:26:57 +03:00 · 78c2e8eef9
parent b7fcbcf0af
commit 78c2e8eef9
1 changed files with 5 additions and 0 deletions
--- a/C64_4joy_adapter/README.md
+++ b/C64_4joy_adapter/README.md
@ -22,3 +22,8 @@ out	0x05, r24
 sei
 ``` 
 375ns
+
+## register as variable
+- https://forum.arduino.cc/index.php?topic=43760.5
+- http://www.nongnu.org/avr-libc/user-manual/FAQ.html#faq_regbind
+- volatile register unsigned char my_register asm("r2");