Delete RAM data and delay function

src/system_function.c

@@ -0,0 +1,34 @@
+#include "BA45F5250.h"
+#include "stdint.h"
+#include "build-in.h"
+#include "system_function.h"
+#include "macro_define.h"
+
+void ram_erase(uint8_t ram_bank)
+{
+	_mp1h = ram_bank;
+    _mp1l = RAM_ADDR_START;
+    _acc = RAM_ADDR_END - RAM_ADDR_START + 1;
+    while (_acc != 0)
+    {
+        _iar1 = 0;
+        ++_mp1l;
+        _acc--;
+    }
+    
+}
+
+void delay(uint16_t count)
+{
+    uint8_t i;
+    for(i = 0; i < count; i++)
+    {
+        #if _HIRCC_8M
+            GCC_DELAY(9993);
+        #elif _HIRCC_4M
+            GCC_DELAY(4993);
+        #else
+            GCC_DELAY(2493);
+        #endif
+    }
+}