VMX51C900 Datasheet, PDF (1/55 Pages) List of Unclassifed Manufacturers – Versa Mix 8051 MCU with LCD Controller and ADC

VMX51C900
Datasheet
Rev 1.2
Versa Mix 8051 MCU with LCD Controller and ADC
Overview
The VMX51C900 is an 8-bit microcontroller with 8KB of
Flash memory, 256 bytes of RAM and based on the
architecture of the standard 80C51 microcontroller.
The VMX51C900 includes extra features such as a 4
Channel 8-bit A/D Converter, 2 PWM outputs and 14
segment x 4 common LCD driver. The VMX51C900
hardware features make it a versatile and cost-effective
controller for a wide range of embedded applications.
The Flash memory can be programmed using a parallel
programmer available from Ramtron. Support is also
available from 3^rd party commercial programmer
manufacturers.
The VMX51C900 is available in PLCC-44, QFP-44 and
DIP-40 packages and operates over the industrial
temperature range.
Features
• 80C51/80C52 pin compatible
• 8KB on-chip Flash memory
• 256 Bytes on-chip data RAM
• 4 8-bit I/O ports and 1 4-bit I/O port
• 4-Channel, 8-bit A/D Converter
• LCD Driver: 14-Segment x 4-Common
• 2-PWM Outputs
• UART serial port
• 3 16-bit Timers/Counters
• Watchdog Timer
• BCD arithmetic + 8-bit Unsigned Multiply and Division
• 2 levels of Interrupt Priority and nested Interrupts
• Power saving modes
• Low EMI (ALE disable)
• Code protection function
• Operates at a clock frequency of up to 25MHz
• Industrial Temperature range (-40°C to +85°C)
• 5V version available
FIGURE 2: VMX51C900 PLCC-44 AND QFP-44 PIN OUT DIAGRAMS
FIGURE 1: VMX51C900 BLOCK DIAGRAM
8KB
FLASH
256 Bytes of
RAM
UART
Serial port
2 INTERRUPT
INPUTS
TIMER 0
TIMER 1
TIMER 2
RESET
8051
PROCESSOR
ADDRESS/
DATA BUS
PORT 0
PORT 1
POWER
CONTROL
PORT 2
PORT 3
WATCHDOG
TIMER
PORT 4
PWM
14 segments
4 Commons
LCD Driver
8 bit A/D
Converter
(4 Inputs)
8
8
8
8
4
2
4 Channel
6
PWMB/P1.5
7
P1.6
P1.7
RES
RXD/P3.0
P4.3
TXD/P3.1
#INT0/P3.2
#INT1/P3.3
ADCIN0/T0/P3.4
ADCIN1/T1/P3.5
17
18
40
39
VMX51C900
PLCC-44
29
28
P0.4/AD4/LCDSEG9
P0.5/AD5/LCDSEG8
P0.6/AD6/LCDSEG7
P0.7/AD7/LCDSEG6
#EA
P4.1
ALE/LCDSEG5
#PSEN/LCDSEG4
P2.7/A15/LCDSEG3
P2.6/A14/LCDSEG2
P2.5/A13/LCDSEG1
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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