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C8051F121-GQR is a series of devices which are fully integrated mixed-signal System-on-a-Chip MCUs with 64 digital I/O pins(100-pin TQFP package) or 32 digital I/O pins(64-pin TQFP package).
It has many unique features:The first one is high-speed pipelined 8051-compatible CIP-51 microcontroller core (100 MIPS or 25 MIPS).The second one is in-system, full-speed,non-intrusive debug interface (on-chip).The third one is five general-purpose 16-bit timers.The forth one is on-chip watchdog timer, VDD monitor, and temperature sensor.The fifth one is external data memory interface with 64k byte address space.The sixth one is 128 kB bytes or 64k bytes of on-chip Flash memory.The seventh one is 8448 bytes of on-chip RAM,etc.
There are some absolute maximum ratings about it.Ambient temperature under bias is 55°C min and 125°C max.Storage Temperature is65°C min and 150°C max.Voltage on VDD with respect to DGND is -0.3 V min and 5.8 V max.Maximum output current sunk by/RST or any port pin is 100 mA max.Maximum total current through VDD and GND is 800 mA max.Voltage on any port I/O pin or/RST with respect to GND is -0.3 V min and 4.2 V max.