Preliminary
• Fully compatible to standard 8051 microcontroller
• Versions for 12/24/40 MHz operating frequency
• Program memory :
   completely external (C501-L)
   8K × 8 ROM (C501-1R)
   8K × 8 OTP memory (C501-1E)
• 256 × 8 RAM
• Four 8-bit ports
• Three 16-bit timers / counters (timer 2 with up/down counter feature)
• USART
• Six interrupt sources, two priority levels
• Power saving modes
• Quick Pulse programming algorithm (C501-1E only)
• 2-Level program memory lock (C501-1E only)
• P-DIP-40, P-LCC-44, and P-MQFP-44 package
• Temperature ranges :
   SAB-C501 TA : 0 ˚C to 70 ˚C
   SAF-C501 TA : – 40 ˚C to 85 ˚C