C501_1 Datasheet, PDF (8/121 Pages) Siemens Semiconductor Group – 8-Bit Single-Chip Microcontroller

Listed below is a summary of the main features of the C501:
• 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
SAF-C501
T_A : 0 ˚C to 70 ˚C
T_A : – 40 ˚C to 85 ˚C
Introduction
C501
XTAL1
XTAL2
RESET
EA/V_PP
ALE/PROG
PSEN
Figure 1-2
Logic Symbol
Semiconductor Group
V_CC V_SS
C501
MCL03217
Port 0
8-Bit Digital Ι /O
Port 1
8-Bit Digital Ι /O
Port 2
8-Bit Digital Ι /O
Port 3
8-Bit Digital Ι /O
1-2