VRS550 / VRS560
VERSA
Datasheet Rev 1.1
1134 Ste Catherine Street West, Suite 900, Montreal, Quebec, Canada H3B 1H4 Tel: (514) 871-2447 http://www.goalsemi.com
2
Overview
The VRS550 and the VRS560 are both low cost 8-bit
microcontrollers based on the standard 80C51
microcontroller family architecture. They are pin-to-pin
compatible and drop-in replacements for most 8051
MCUs. The VRS550 and VRS560 have 8kB and 16kB,
respectively of Flash memory. Both devices have 256
bytes of RAM memory.
The hardware features of these devices and their re-
programmability make them suitable for a wide range of
applications.
These VRS550 and VRS560 are both available in
PLCC-44 and QFP-44 packages in the Industrial
temperature range. The Flash memory can be
programmed using programmers available from Goal
Semiconductor
or
other
3rd
party
commercial
programmers.
FIGURE 1: VRS550 / VRS560 FUNCTIONAL DIAGRAM
PORT 0
8051
PROCESSOR
PORT 3
PORT 2
PORT 1
8k / 16k
FLASH
2 INTERRUPT
INPUTS
UART
256 bytes of
RAM
RESET
TIMER 0
TIMER 2
TIMER 1
POWER
CONTROL
WATCHDOG
TIMER
ADDRESS/
DATA BUS
8
8
8
8
Feature Set
•
General 80C51/80C52 pin compatible
•
12 clock periods per machine cycle
•
8k / 16k 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
•
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 25MHz
•
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: VRS550 / VRS560 PLCC AND QFP PINOUT DIAGRAMS
P1.6
P1.5
RESET
P1.7
NC
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
NC
ALE
P0.7/AD7
#EA
P0.5/AD5
P0.6/AD6
P0.4/AD4
1
VRS550 / VRS560
PLCC-44
6
7
17
18
28
29
39
40
1
44
11
12
22
23
33
34
VRS550 / VRS560
QFP-44
#RD/P3.7
#WR/P3.6
XTAL1
XTAL2
NC
VSS
P2.1/A9
P2.0/A8
P2.3/A11
P2.2/A10
P2.4/A12
P1.3
P1.4
T2EX/P1.1
P1.2
NC
T2/P1.0
P0.0/AD0
VDD
P0.2/AD2
P0.1/AD1
P0.3/AD3