VRS51X540 Datasheet, PDF (1/40 Pages) List of Unclassifed Manufacturers – Versa 8051 MCU with 4KB Flash

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 3^rd party commercial
programmers.
FIGURE 1: VRS51X540 FUNCTIONAL DIAGRAM
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
8051
PROCESSOR
ADDRESS/
DATA BUS
4KB
FLASH
128 Bytes of
RAM
PORT 0
8
PORT 1
8
UART
PORT 2
8
2 INTERRUPT
INPUTS
PORT 3
8
TIMER 0
TIMER 1
TIMER 2
RESET
POWER
CONTROL
WATCHDOG
TIMER
6
40
P1.5
7
1
39
P0.4/AD4
P1.6
P0.5/AD5
P1.7
P0.6/AD6
RESET
P0.7/AD7
RXD/P3.0
NC
TXD/P3.1
VRS51x540
#EA
NC
PLCC -4 4
ALE
#INT0/P3.2
#PSEN
#INT1/P3.3
P2.7/A15
T0/P3.4
P2.6/A14
T1/P3.5
17
18
29
28
P2.5/A13
P0.3/AD3
P0.2/AD2
P0.1/AD1
P0.0/AD0
VDD
NC
T2/P1.0
T2EX/P1.1
P1.2
P1.3
P1.4
3
2
33
32
4
2
VRS51x540
QFP-44
4
1
41
12
1
P2.4/A12
P2.3/A11
P2.2/A10
P2.1/A9
P2.0/A8
NC
VSS
XTAL1
XTAL2
#RD/P3.7
#WR/P3.6
Ramtron International Corporation ? http://www.ramtron.com
1850 Ramtron Drive Colorado Springs ? MCU customer service: 1-800-943-4625, 1-514-871-2447, ext. 208
Colorado, USA, 80921 ? 1-800-545-FRAM, 1-719-481-7000
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