8xC151SA/SB Product Overview The 8xC151SA/SB features a rich combination of integrated peripherals. The Programmable Counter Array (PCA) provides flexibility for applications that require real time compare/capture, high speed I/O and pulse width modulation capabilities. Also included is an enhanced serial port for multi processor communication, a hardware watchdog timer, a program lock scheme for on-chip program memory and power management modes. The 8xC151SA/SB has 256 bytes of on-chip data RAM and is available in 16 Kbytes and 8 Kbytes of on-chip ROM/OTPROM or ROMless options. The 8xC151SA/SB is instruction set compatible with MCS 51 microcontrollers. 8xC151SA/SB Block Diagram FEATURES 8xC151SA/SB BENEFITS New core architecture Up to 5X performance increase using existing codes Reduce RFI design considerations Binary code and pin compatible with MCS 51 microcontroller Direct "drop-in" performance upgrade Software investment protected Minimal to zero hardware redesign Quick time to market 8 Kbytes/16 Kbytes on-chip ROM/OTPROM or ROMless version Flexibility in using different memory options in development and production Programmable Counter Array (PCA) supports Real-time capture and compare High speed output PWM Flexibility and performance enhancement in real-time control applications such as: Measurement of duty cycle, phase difference and frequency Real-time interrupt generation and output toggling Adjustable duty cycle generation Hardware watchdog timer Increased system reliability Page mode configuration Increases the performance for external instruction fetch by 2X Programmable wait states (0-3) configuration and external wait pin capability Flexibility in external memory and peripheral interface Allows the use of either fast or slow memory Support seven interrupt sources, each with four interrupt priority levels Increased flexibility for event control applications

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