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VRS51L540

Ramtron
Part Number VRS51L540
Manufacturer Ramtron
Description Versa 8051 MCU
Published Aug 3, 2007
Detailed Description www.DataSheet4U.com VRS51x540 Datasheet Rev 1.2 Versa 8051 MCU with 4KB Flash Overview The VRS51x540 is a low cost 8-b...
Datasheet PDF File VRS51L540 PDF File

VRS51L540
VRS51L540

Overview
www.
DataSheet4U.
com VRS51x540 Datasheet Rev 1.
2 Versa 8051 MCU with 4KB Flash Overview The VRS51x540 is a low cost 8-bit microcontroller based on the standard 80C51 microcontroller family architecture.
It is pin compatible and is a drop-in replacement for standard 8051 MCUs Aimed at cost effective applications requiring small amounts of program/data memory coupled with streamlined peripheral support, the VRS51x540 includes 4KB of Flash memory, 128 bytes of RAM a UART, three 16-bit timers, a Watchdog timer and power down features.
The VRS51x540 is available in 5 (VRS51C540) and 3.
3 (VRS51L540) volt versions in PLCC-44, QFP-44 and DIP-40 packages.
The VRS51x540 devices operate over the entire industrial temperature range.
The Flash memory can be programmed using programmers available from Ramtron or other 3rd party commercial programmers.
FIGURE 1: VRS51X540 FUNCTIONAL DIAGRAM P1.
2 T2EX/P1.
1 Feature Set • • • • • • • • • • • • • • • • • • • 80C51/80C52 pin compatible 12 clock periods per machine cycle 4KB on-chip Flash memory 128 bytes on-chip data RAM 32 I/O lines: P0-P3 = 8-bit 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 of up to 40MHz Low EMI (inhibit ALE) Programming voltage: 12V Industrial Temperature range (-40°C to +85°C) 5V and 3V versions available (see ordering information.
) FIGURE 2: VRS51X540 PLCC AND QFP PINOUT DIAGRAMS P0.
0/AD0 P0.
2/AD2 8051 PROCESSOR P1.
5 7 6 1 P0.
3/AD3 40 39 P0.
1/AD1 T2/P1.
0 P1.
3 VDD P1.
4 NC P0.
4/AD4 P0.
5/AD5 P0.
6/AD6 P0.
7/AD7 #EA NC ALE #PSEN P2.
7/A15 ADDRESS/ DATA BUS P1.
6 P1.
7 RESET RXD/P3.
0 4KB FLASH 128 Bytes of RAM PORT 0 8 NC TXD/P3.
1 #INT0/P3.
2 #INT1/P3.
3 T0/P3.
4 T1/P3.
5 17 18 VRS51x540 PLCC-44 PORT 1 8 28 29 P2.
6/A14 P2.
5/A13 #RD/P3.
7 P2.
0/A8 P2.
1/A9 P2.
2/A1...


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