8XC51RA/RB/RC Hardware Description

The 8XC51RA/RB/RC is a highly integrated 8-bit microcontroller based on the MCS(R) 51 architecture. As a member of the MCS 51 family, the 8XC51RA/RB/RC is optimized for control applications. Its key features are 512 bytes on-chip RAM and watchdog timer. Also included are an enhanced serial port for multiprocessor communications, an up/down timer/counter and enhanced program lock scheme for the on-chip pro- gram memory. Since the 8XC51RA/RB/RC products are CHMOS, they have two software selectable reduced power modes: Idle Mode and Power Down Mode.

The 8XC51RA/RB/RC uses the standard 8051 instruction set and is pin-for-pin compatible with the existing MCS 51 family of products.

This document presents a comprehensive description of the on-chip hardware features of the 8XC51RA/RB/ RC. ROM EPROM ROMless ROM/ RAM

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