Introduction
The C505CA-xC derivatives, which refer to C505CA-4RC and C505CA-LC in this document, are high performance derivatives of the Infineon C500 family of 8-bit microcontrollers. The C505CA-xC derivatives are fully compatible to the standard 8051 microcontroller. Additionally the C505CA-xC provides extended power save provisions, on-chip RAM, 1K byte XRAM, on-chip ROM, 10-bit A/D converter, and RFI related improvements.

Features
• Fully compatible to standard 8051 microcontroller
• Superset of the 8051 architecture with 8 datapointers
• Up to 20 MHz operating frequency
    – 375 ns instruction cycle time @16 MHz
    – 300 ns instruction cycle time @20 MHz (50% duty cycle)
• On-chip program memory (with optional memory protection)
    – 32K byte on-chip Mask ROM
    – alternatively up to 64k byte external program memory
• 256 byte on-chip RAM
• 1K byte On-chip XRAM
• 32 + 2 digital I/O lines
    – Four 8-bit digital I/O ports
    – One 2-bit digital I/O port (port 4)
    – Port 1 with mixed analog/digital I/O capability
• Three 16-bit timers/counters
    – Timer 0 / 1 (C501 compatible)
    – Timer 2 with 4 channels for 16-bit capture/compare operation
• Full duplex serial interface with programmable baudrate generator (USART)
• Full CAN Module, version 2.0 B compliant
    – 256 register/data bytes located in external data memory area
    – 1 MBaud CAN baudrate when operating frequency is equal to or above 8 MHz
    – internal CAN clock prescaler when input frequency is over 10 MHz
• On-chip A/D Converter
    – up to 8 analog inputs
    – 10-bit resolution
• Twelve interrupt sources with four priority levels
• On-chip emulation support logic (Enhanced Hooks Technology TM1))
• Programmable 15-bit watchdog timer
• Oscillator watchdog
• Fast power on reset
• Power Saving Modes
    – Slow-down mode
    – Idle mode (can be combined with slow-down mode)
    – Software power-down mode with wake up capability through P3.2/INT0 or P4.1/RXDC pin
• Temperature ranges:
    SAB-C505 versions TD = 0 to 70 °C
    SAF-C505 versions TD = -40 to 85 °C
    SAK-C505 versions TD = -40 to 125 °C
    SAA-C505 versions TD = -40 to 150 °C