VRS51L1050
Preliminary Datasheet
Rev 1.2
Versa 8051 3.3V MCU with 64KB of IAP/ISP Flash
Overview
The VRS51L1050 is based on the standard 8051
microcontroller family architecture and is a pin
compatible drop-in replacement for most 8051 MCUs.
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.
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.
The VRS51L1050 is available in PLCC-44, QFP-44 and
DIP-40 packages and functions over the commercial
temperature range.
F
IGURE
1: VRS51L1050 F
UNCTIONAL
D
IAGRAM
64KB
FLASH
1024 Bytes of
SRAM
Feature Set
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
8051/8052 pin compatible
64KB on-chip Flash memory
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
F
IGURE
2: VRS51L1050 QFP-44
AND
PLCC-44 P
IN OUT
D
IAGRAMS
P0.4/AD4
P0.5/AD5
P0.6/AD6
P0.7/AD7
#EA
#PSEN
P2.7/A15
P2.6/A14
P2.5/A13
23
22
33
P0.3/AD3
P0.2/AD2
P0.1/AD1
P0.0/AD0
VDD
P4.2
T2/P1.0
T2EX/P1.1
PWM0/P1.2
PWM1/P1.3
P1.4
34
P4.1
ALE
P2.4/A12
P2.3/A11
P2.2/A10
VRS51L1050
QFP-44
P2.1/A9
P2.0/A8
P4.0
VSS
XTAL1
XTAL2
44
1
12
11
#RD/P3.7
#WR/P3.6
SDA/P1.7
P4.3
TXD/P3.1
P1.5
SCL/P1.6
#INT0/P3.2
RES
RXD/P3.0
8051
PROCESSOR
ADDRESS/
DATA BUS
T2EX/P1.1
P0.2/AD2
VDD
P0.0/AD0
P0.1/AD1
I2C
PORT 1
8
6
1
P1.5
SCL/P1.6
P0.3/AD3
40
PORT 0
8
P1.4
P1.3/PWM1
P1.2/PWM0
T2/P1.0
P4.2
#INT1/P3.3
T0/P3.4
T1/P3.5
7
39
UART
PORT 2
8
SDA/P1.7
RES
RXD/P3.0
P4.3
P0.4/AD4
P0.5/AD5
P0.6/AD6
P0.7/AD7
#EA
P4.1
ALE
#PSEN
P2.7/A15
2 INTERRUPT
INPUTS
TIMER 0
TIMER 1
TIMER 2
RESET
POWER
CONTROL
PORT 3
8
TXD/P3.1
#INT0/P3.2
#INT1/P3.3
T0/P3.4
T1/P3.5
17
18
VRS51L1050
PLCC-44
PORT 4
4
29
28
P2.6/A14
P2.5/A13
P2.1/A9
P2.2/A10
P2.3/A11
XTAL1
P2.0/A8
#WR/P3.6
#RD/P3.7
XTAL2
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
P2.4/A12
VSS
P4.0
page 1 of 49
RAMTRON [ RAMTRON INTERNATIONAL CORPORATION ]
