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Ramtron
Ramtron

VRS51C540 Datasheet Preview

VRS51C540 Datasheet

Versa 8051 MCU

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VRS51C540 pdf
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VRS51x540
Datasheet
Rev 1.2
Versa 8051 MCU with 4KB Flash
Overview
The VRS51x540 is a low cost 8-bit microcontroller
based on the standard 80C51 microcontroller family
architecture. It is pin compatible and is a drop-in
replacement for standard 8051 MCUs
Aimed at cost effective applications requiring small
amounts of program/data memory coupled with
streamlined peripheral support, the VRS51x540 includes
4KB of Flash memory, 128 bytes of RAM a UART, three
16-bit timers, a Watchdog timer and power down
features.
The VRS51x540 is available in 5 (VRS51C540) and 3.3
(VRS51L540) volt versions in PLCC-44, QFP-44 and
DIP-40 packages. The VRS51x540 devices operate
over the entire industrial temperature range. The Flash
memory can be programmed using programmers
available from Ramtron or other 3rd party commercial
programmers.
FIGURE 1: VRS51X540 FUNCTIONAL DIAGRAM
Feature Set
80C51/80C52 pin compatible
12 clock periods per machine cycle
4KB on-chip Flash memory
128 bytes on-chip data RAM
32 I/O lines: P0-P3 = 8-bit
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: VRS51X540 PLCC AND QFP PINOUT DIAGRAMS
4KB
FLASH
128 Bytes of
RAM
8051
PROCESSOR
ADDRESS/
DATA BUS
PORT 0
PORT 1
UART
PORT 2
2 INTERRUPT
INPUTS
TIMER 0
TIMER 1
TIMER 2
RESET
POWER
CONTROL
WATCHDOG
TIMER
PORT 3
8
8
8
8
6 40
P1.5
7
1
39 P0.4/AD4
P1.6
P0.5/AD5
P1.7
P0.6/AD6
RESET
P0.7/AD7
RXD/P3.0
NC
TXD/P3.1
VRS51x540
PLCC -4 4
#EA
NC
ALE
#INT0/P3.2
#PSEN
#INT1/P3.3
P2.7/A15
T0/P3.4
P2.6/A14
T1/P3.5
17
18
29
28
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
32
3 3 32
42
VRS51x540
QFP-44
41
41
12
1
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
page 1 of 40



Ramtron
Ramtron

VRS51C540 Datasheet Preview

VRS51C540 Datasheet

Versa 8051 MCU

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VRS51C540 pdf
VRS51x540
Pin Descriptions for QFP-44
TABLE 1: PIN DESCRIPTIONS FOR QFP-44/
QFP
- 44
Name
1 P1.5
2 P1.6
3 P1.7
4 RES
5
RXD
P3.0
6 NC
7
TXD
P3.1
8
#INT0
P3.2
9
#INT1
P3.3
10
T0
P3.4
11
T1
P3.5
12
#WR
P3.6
13
#RD
P3.7
14 XTAL2
15 XTAL1
16 VSS
17 NC
18
P2.0
A8
19
P2.1
A9
20
P2.2
A10
21
P2.3
A11
22 P2.4
A12
23
P2.5
A13
I/O Function
I/O Bit 5 of Port 1
I/O Bit 6 of Port 1
I/O Bit 7 of Port 1
I Reset
I Receive Data
I/O Bit 0 of Port 3
- No Connect
O Transmit Data &
I/O Bit 1 of Port 3
I External Interrupt 0
I/O Bit 2 of Port 3
I External Interrupt 1
I/O Bit 3 of Port 3
I Timer 0
I/O Bit 4 of Port 3
I Timer 1 & 3
I/O Bit 5 of Port
O Ext. Memory Write
I/O Bit 6 of Port 3
O Ext. Memory Read
I/O Bit 7 of Port 3
O Oscillator/Crystal Output
I Oscillator/Crystal In
- Ground
- No Connect
I/O Bit 0 of Port 2
O Bit 8 of External Memory Address
I/O Bit 1 of Port 2
O Bit 9 of External Memory Address
I/O Bit 2 of Port 2
O Bit 10 of External Memory Address
I/O Bit 3 of Port 2 &
O Bit 11 of External Memory Address
I/O Bit 4 of Port 2
O Bit 12 of External Memory Address
I/O Bit 5 of Port 2
O Bit 13 of External Memory Address
QFP
- 44
Name
I/O
Function
24
P2.6
A14
I/O Bit 6 of Port 2
O Bit 14 of External Memory Address
25
P2.7
A15
I/O Bit 7 of Port 2
O Bit 15 of External Memory Address
26 #PSEN O
Program Store Enable
27 ALE
O Address Latch Enable
28 NC
- No Connect
29 #EA
I
External Access
30
P0.7
AD7
I/O Bit 7 Of Port 0
I/O Data/Address Bit 7 of External Memory
31
P0.6
AD6
I/O Bit 6 of Port 0
I/O Data/Address Bit 6 of External Memory
32
P0.5
AD5
I/O Bit 5 of Port 0
I/O Data/Address Bit 5 of External Memory
33
P0.4
AD4
I/O Bit 4 of Port 0
I/O Data/Address Bit 4 of External Memory
34
P0.3
AD3
I/O Bit 3 Of Port 0
I/O Data/Address Bit 3 of External Memory
35
P0.2
AD2
I/O Bit 2 of Port 0
I/O Data/Address Bit 2 of External Memory
36
P0. 1
AD1
I/O Bit 1 of Port 0 & Data
I/O Address Bit 1 of External Memory
37
P0.0
AD0
I/O Bit 0 Of Port 0 & Data
I/O Address Bit 0 of External Memory
38 VDD
-
VCC
39 NC
- No Connect
40
T2
P1.0
I Timer 2 Clock Out
I/O Bit 0 of Port 1
41
T2EX
P1.1
I
I/O
Timer 2 Control
Bit 1 of Port 1
42 P1.2
I/O Bit 2 of Port 1
43 P1.3
I/O Bit 3 of Port 1
44 P1.4
I/O Bit 4 of Port 1
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
32
3 3 32
42
VRS51x540
QFP-44
41
41
12
1
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
________________________________________________________________________________________________
www.ramtron.com
page 2 of 40


Part Number VRS51C540
Description Versa 8051 MCU
Maker Ramtron
Total Page 30 Pages
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