AT89S52 40-Pin 24MHz 8kb 8-bit Microcontroller

Special Microcontroller Features Fail-Safe Clock Monitor Power-On Reset Power-up Timer (PWRT) and Oscillator Start-Up Timer (OST) Two-Speed Start-Up mode Programmable Code Protection Power-Saving Sleeping Mode  Peripheral Features Two 8-bit timer/counter with Prescalar One 16-bit timer/counter High source/sink current: 25mA Master Synchroonous Serial Port (MSSP) Parallel Slave Port (PSP): 40/44 pin-device only  Low-Power Features Primary Run(XT, RC, Oscillator, 76 µA, 1MHz, 2V) RC_RUN (7µA, 31.25kHz, 2V) Timer1 Oscillator (1.8 µA, 32kHz, 2V) Wachtdog Timer(0.7 µA, 2V) Two-Speed Oscillator Start-up  Analog Features 10-bit, up to 14-channel Analog-to-Digital Converter Dual Analog Comparators Programmable Low-Current Brown-out Reset (NOR) Circuitry Programmable Low-Voltage Detect (LVD)  Oscillators Three Crystal modes: LP, XT, HS (up to 20 MHz) Two External RC modes ECIO (up to 20 MHz) 8 user-selectable frequencies