The DS87C530 is an 8051 compatible microcontroller based on the Dallas High Speed core. It uses four clocks per instruction cycle instead of 12 used by the standard 8051. It also provides a unique mix of peripherals not widely available on other processors. They include an onchip Real Time Clock (RTC) and battery back up support for an onchip 1K x 8 SRAM. The new Power Management Mode allows software to select reduced power operation while still processing.