The Power-down Mode saves the RAM contents but freezes the oscillator disabling all other chip functions until the next hardware reset. The Idle Mode stops the CPU while allowing the RAM, timer/counters, serial port and interrupt system to continue functioning. In addition, the AT89C51 is designed with static logic for operation down to zero frequency and supports two software selectable power saving modes. The AT89C51 provides the following standard features: 4K bytes of Flash, 128 bytes of RAM, 32 I/O lines, two 16-bit timer/counters, a five vector two-level interrupt architecture, a full duplex serial port, on-chip oscillator and clock circuitry. PSEN ALE/PROG EA / VPP RST PORT 1 LATCH PORT 3 LATCH TIMING AND CONTROL INSTRUCTION REGISTER DPTR By combining a versatile 8-bit CPU with Flash on a monolithic chip, the Atmel is a powerful microcomputer which provides a highly-flexible and cost-effective solution to many embedded control applications. The on-chip Flash allows the program memory to be reprogrammed in-system by a conventional nonvolatile memory programmer. The device is manufactured using Atmel's high-density nonvolatile memory technology and is compatible with the industry-standard MCS-51 instruction set and pinout. The is a low-power, high-performance CMOS 8-bit microcomputer with 4K bytes of Flash programmable and erasable read only memory (PEROM). Endurance: 1,000 Write/Erase Cycles Fully Static Operation: to 24 MHz Three-level Program Memory Lock x 8-bit Internal RAM 32 Programmable I/O Lines Two 16-bit Timer/Counters Six Interrupt Sources Programmable Serial Channel Low-power Idle and Power-down Modes Compatible with MCS-51TM Products 4K Bytes of In-System Reprogrammable Flash Memory
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