VRS51X550

www.DataSheet4U.com VRS51x550/560 Datasheet Rev 1.3 Versa 8051 MCUs with 8/16KB Flash Overview The VRS51x550 and VRS51x560 are low-cost 8-bit microcontrollers based on the standard 80C51 microcontroller architecture. They are pin compatible drop-in replacements for the 8051 Ideal for a wide range of applications requiring low to midrange amounts of program/data memory, coupled with streamlined peripheral support, the VRS51x550/560 devices feature 8KB/16KB, of Flash memory (respectively), 256 bytes of RAM, a UART, three 16-bit timers, a watchdog timer and power saving modes. The VRS51x550 is available in 3.3 (VRS51L550) or 5 volt versions (VRS51C550), while the VRS51x560 is available in a 5 volt version (VRS51C560). All devices come in PLCC-44, QFP-44 and DIP-40 packages and operate in the industrial temperature range. Flash can be programmed using a parallel programmer available from Ramtron or with a third party commercial programmer. FIGURE 1: VRS51X550 / VRS51X560 FUNCTIONAL DIAGRAM P1.4 P1.3 Feature Set 80C51/80C52 pin compatible 12 clock periods per machine cycle 8KB / 16KB on-chip Flash memory 256 Bytes on-chip data RAM 32 I/O lines on four 8-bit ports Full duplex serial port (UART) 3, 16-bit Timers/Counters Watchdog Timer 8-bit Unsigned Division / Multiply BCD arithmetic Direct and Indirect Addressing Two levels of interrupt priority and nested interrupts Power saving modes Code protection function Operates at a clock frequency...