Introduction
The C517A is a high-end member of the Siemens C500 family of 8-bit microcontrollers. lt is functionally fully compatible with the SAB-80C517A/83C537A-5 microcontrollers.
The C517A basically operates with internal and/or external program memory. The C517A-L is identical to the C517A-4R, except that it lacks the on-chip program memory. Therefore, in this documentation the term C517A refers to all versions within this specification unless otherwise noted.

Listed below is a summary of the main features of the C517A:
• Full upward compatibility with SAB 80C517A/83C517A-5
• Up to 24 MHz external operating frequency
   – 500 ns instruction cycle at 24 MHz operation
• Superset of the 8051 architecture with 8 datapointers
• 32K byte on-chip ROM (with optional ROM protection)
   – alternatively up to 64K byte external program memory
• Up to 64K byte external data memory
• 256 byte on-chip RAM
• 2K byte on-chip RAM (XRAM)
• Seven 8-bit parallel I/O ports
• Two input ports for analog/digital input
• Two full duplex serial interfaces (USART)
   – 4 operating modes, fixed or variabie baud rates
   – programmable baud rate generators
• Four 16-bit timer/counters
   – Timer 0 / 1 (C501 compatible)
   – Timer 2 for 16-bit reload, compare, or capture functions
   – Compare timer for compare/capture functions
• Powerful 16-bit compare/capture unt (CCU) with up to 21 high-speed or PWM output channels
   and 5 capture inputs
• 10-bit A/D converter
   – 12 multiplexed analog inputs
   – Built-in self calibration
• Extended watchdog facilities
   – 15-bit programmable watchdog timer
   – Oscillator watchdog
• Power saving modes
   – Slow down mode
   – Idle mode (can be combined with slow down mode)
   – Software power down mode
   – Hardware power down mode
• 17 interrupt sources (7 external, 10 internal) selectable at 4 priority levels
• On-chip emulation support logic (Enhanced Hooks Technology TM)
• P-MQFP-100 and P-LCC-84 packages
• Temperature Ranges : SAB-C517A TA = 0 to 70 °C
                                        SAF-C517A TA = -40 to 85 °C
                                       SAH-C517A TA = -40 to 110 °C