VRS51L1050
Preliminary Datasheet
Rev 1.2
Versa 8051 3.3V MCU with 64KB of IAP/ISP Flash
Overview
Feature Set
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8051/8052 pin compatible
64KB on-chip Flash memory
The VRS51L1050 is based on the standard 8051
microcontroller family architecture and is pin
compatible drop-in replacement for most 8051 MCUs.
a
In-System/In-Application Flash Programming (ISP/IAP)
On-chip Charge Pump for Flash Programming
1024 Bytes on-chip Data SRAM
Four 8-bit I/O Ports, one 4-bit I/O Port
2 PWM Outputs on P1.2 to P1.3 (8/5-bit resolution)
1 Full Duplex UART Serial Port
I²C-compatible Interface
Three 16-bit Timers/Counters
Bit Operation Instruction
8-bit Unsigned Division and Multiply
BCD Arithmetic
Direct and Indirect Addressing
7 Interrupt Sources and 2 Levels of Interrupt Priority
Power saving modes
Wakeup from Power Down by Ext. Interrupt or Reset
Code protection function
Low EMI (inhibit ALE)
Commercial Temperature Range (0°C to +70°C)
3.3V Operating Voltage
The VRS51L1050 is designed for applications that
require a large amount of program/data memory with
non-volatile data storage and/or code/field based
firmware
upgrade
capability
coupled
with
comprehensive peripheral support. It features 64KB of
In-System/In-Application Programmable Flash memory,
1KB of SRAM, an I²C-compatible interface, 2 PWM
output channels, a UART, three 16-bit timers and the
ability to exit the power down mode upon assertion of
an external interrupt (INT0 / INT1).
Ideal
for
battery-powered
applications,
the
VRS51L1050 registers and I/Os maintain their current
value in power down mode while the oscillator is
disabled, enabling the supply current to drop below
20uA.
FIGURE 2: VRS51L1050 QFP-44 AND PLCC-44 PIN OUT DIAGRAMS
The VRS51L1050 is available with firmware that
enables In-System Programming (firmware based boot-
loader) of the Flash memory via the UART interface
(ISPVx version). General Flash memory programming
is supported by device programmers available from
Ramtron or other 3rd party suppliers.
33
23
22
34
P0.3/AD3
P0.2/AD2
P0.1/AD1
P0.0/AD0
VDD
P2.4/A12
P2.3/A11
P2.2/A10
P2.1/A9
P2.0/A8
P4.0
The VRS51L1050 is available in PLCC-44, QFP-44 and
DIP-40 packages and functions over the commercial
temperature range.
VRS51L1050
QFP-44
P4.2
T2/P1.0
VSS
T2EX/P1.1
PWM0/P1.2
PWM1/P1.3
P1.4
XTAL1
XTAL2
#RD/P3.7
#WR/P3.6
FIGURE 1: VRS51L1050 FUNCTIONAL DIAGRAM
44
12
11
1
64KB
FLASH
8051
PROCESSOR
ADDRESS/
DATA BUS
1024 Bytes of
SRAM
PORT 0
8
8
8
8
4
I2C
PORT 1
PORT 2
PORT 3
PORT 4
6
1
40
7
39
P1.5
SCL/P1.6
SDA/P1.7
RES
P0.4/AD4
P0.5/AD5
P0.6/AD6
UART
P0.7/AD7
#EA
RXD/P3.0
P4.3
VRS51L1050
PLCC-44
P4.1
2 INTERRUPT
INPUTS
TXD/P3.1
#INT0/P3.2
#INT1/P3.3
T0/P3.4
ALE
#PSEN
P2.7/A15
P2.6/A14
P2.5/A13
TIMER 0
TIMER 1
TIMER 2
T1/P3.5
17
29
28
18
POWER
CONTROL
RESET
PWM
2
Ramtron International Corporation
1850 Ramtron Drive Colorado Springs
Colorado, USA, 80921
http://www.ramtron.com
MCU customer service: 1-800-943-4625, 1-514-871-2447 x 208
1-800-545-FRAM, 1-719-481-7000
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page 1 of 49
RAMTRON [ RAMTRON INTERNATIONAL CORPORATION ]
