The Power-down mode saves the RAM contents but freezes the oscillator, disabling all other chip functions until the next interrupt or 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 AT89S52 is designed with static logic for operation down to zero frequency and supports two software selectable power saving modes. The AT89S52 provides the following standard features: 8K bytes of Flash, 256 bytes of RAM, 32 I/O lines, Watchdog timer, two data pointers, three 16-bit timer/counters, a six-vector two-level interrupt architecture, a full duplex serial port, on-chip oscillator, and clock circuitry.

By combining a versatile 8-bit CPU with in-system programmable Flash on a monolithic chip, the Atmel AT89S52 is a powerful microcontroller 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 or 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 80C51 instruction set and pinout. It enters ISP mode when RST pin is pulled high. Lab Tool-848 Turbo Gang Programmer Advantech Equipment Company MP. MX51, AX51 Hitex iC1000 PowerEmulator iSystem MetaICE-XF 8051 In-Circuit Emulator Metalink Corporation Device Programmers.

Interrupt-Driven Serial I/O Support for printf ISR-Driven Serial I/O V2 Emulators. The AT89S52 is a low-power, high-performance CMOS 8-bit microcontroller with 8K bytes of in-system programmable Flash memory. Step 2: Wire the AT89S52 to the Arduino The AT89S52 (AT89S51 too) uses SPI as the ISP protocol. The Atmel AT89S52 is an 8051 based Full Static CMOS controller.

Serial port programmer for at89s52