AT89S52 Datasheet PDF - Microchip

ATMEL AT89S52-24PU 8Bit Microcontroller, Low Voltage High Performance CMOS, AT89S52, 24MHz, 8KB, 256Byte, 40Pins

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IC, 8Bit MCU, MCU 5X, 24MHz, 44-TQFP; Controller Family/Series:C51/C251; Core Size:8Bit; No. of I/O"s:32; Program Memory Size:8KB; RAM Memory Size:250Byte; CPU Speed:24MHz; Oscillator Type:External, Internal; No. of Timers:3 ;RoHS Compliant: Yes