Ramtron International Corporation
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http://www.ramtron.com
1850 Ramtron Drive Colorado Springs
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MCU customer service: 1-800-943-4625, 1-514-871-2447, ext. 208
Colorado, USA, 80921
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1-800-545-FRAM, 1-719-481-7000
page 1 of 49
VRS51x570/580
Datasheet
Rev 1.2
Versa 8051 MCUs with 32/64KB
Overview
The VRS51x570 and the VRS51x580 are low cost 8-bit
microcontrollers
based
on
the
standard
80C51
microcontroller family architecture.
They are pin
compatible and drop-in replacements for most 8051
MCUs.
Ideal for a wide range of applications requiring large
amounts
of
program/data
memory,
coupled
with
comprehensive peripheral support, the VRS51x570/580
devices
include
32KB/64KB
of
Flash
memory,
respectively, and 1KB of SRAM, 5 PWM output
channels, a UART, three 16-bit timers, a Watch Dog
timer and power down features.
These devices also include a fifth, 4-bit, I/O port mapped
into the “no connect” pins of the standard 8051/52
package. This provides a total of 36 I/Os while
maintaining compatibility with standard 80C51/52 pin
outs.
The VRS51x570 and VRS51x580 are available in
PLCC-44, QFP-44 and DIP-40 packages in the Industrial
temperature
range.
The
Flash
memory
can
be
programmed using programmers from Ramtron or other
3
rd party commercial programmer suppliers.
FIGURE 1: VRS51X570 / VRS51X580 FUNCTIONAL DIAGRAM
PORT 0
8051
PROCESSOR
PORT 3
PORT 2
PORT 1
PWM
PORT 4
64KB
FLASH
2 INTERRUPT
INPUTS
UART
1024 Bytes of
RAM
RESET
TIMER 0
TIMER 2
TIMER 1
POWER
CONTROL
WATCHDOG
TIMER
ADDRESS/
DATA BUS
8
8
8
8
4
5
Feature Set
•
80C51/80C52 pin compatible
•
12 clock periods per machine cycle
•
32KB / 64KB on-chip Flash memory
•
1024 Bytes on-chip data RAM
•
36 I/O lines: P0-P3 = 8-bit, P4 = 4-bit
•
5-Channel PWM on P1.3 to P1.7
•
Full duplex serial port (UART)
•
Three 16-bit Timers/Counters
•
Watch Dog 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: VRS51X570 / VRS51X580 PLCC AND QFP PINOUT DIAGRAMS
PWM3/P1.6
PWM2/P1.5
RESET
PWM4/P1.7
P4.3
RXD/P3.0
#INT0/P3.2
TXD/P3.1
T0/P3.4
#INT1/P3.3
T1/P3.5
P2.6/A14
P2.5/A13
#PSEN
P2.7/A15
P4.1
ALE
P0.7/AD7
#EA
P0.5/AD5
P0.6/AD6
P0.4/AD4
1
VRS51x570/580
PLCC-44
6
7
17
18
28
29
39
40
1
44
11
12
22
23
33
34
VRS51x570/580
QFP-44
#RD/P3.7
#WR/P3.6
XTAL1
XTAL2
P4.0
VSS
P2.1/A9
P2.0/A8
P2.3/A11
P2.2/A10
P2.4/A12
PWM0/P1.3
PWM1/P1.4
T2EX/P1.1
P1.2
P4.2
T2/P1.0
P0.0/AD0
VDD
P0.2/AD2
P0.1/AD1
P0.3/AD3
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