VRS51X550 Datasheet, PDF (1/40 Pages) List of Unclassifed Manufacturers – Versa 8051 MCUs with 8/16KB Flash

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
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 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: VRS51X550 / VRS51X560 PLCC AND QFP PINOUT DIAGRAMS
8051
PROCESSOR
ADDRESS/
DATA BUS
8KB / 16KB
FLASH
256
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
P1.5
P1.6
P1.7
RESET
RXD/P3.0
NC
TXD/P3.1
#INT0/P3.2
#INT1/P3.3
T0/P3.4
T1/P3.5
6
40
7
1
39
VRS51x550/560
PLCC-44
17
29
18
28
P0.4/AD4
P0.5/AD5
P0.6/AD6
P0.7/AD7
#EA
NC
ALE
#PSEN
P2.7/A15
P2.6/A14
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
33
34
23
22
VRS51x550/560
QFP-44
44
12
1
11
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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