Atmel C51 User manual

C51 Microcontrollers Demo Board
..............................................................................................
User Guide

C51 Microcontrollers Demo Board User Guide i
4119C–8051–3/03
Table of Contents
Section 1
Introduction...........................................................................................1-2
1.1 C51/C251 Support ....................................................................................1-2
1.2 Demo Board Features...............................................................................1-3
Section 2
Hardware Description ...........................................................................2-4
2.1 Block Diagram...........................................................................................2-4
2.2 Specifications............................................................................................2-4
2.3 Supported Microcontrollers.......................................................................2-4
2.4 Board Supply Considerations....................................................................2-5
2.5 Board Layout.............................................................................................2-6
2.6 J11 Switches.............................................................................................2-7
Section 3
Operation Mode..................................................................................3-10
3.1 Flash Products........................................................................................3-10
3.1.1 Switch Configuration.........................................................................3-10
3.1.2 Running ISP .....................................................................................3-10
3.2 ISP External Flash Memory Mode ..........................................................3-11
3.2.1 Hardware Configuration....................................................................3-11
3.2.2 Terminal Configuration.....................................................................3-11
3.2.3 ISP Operation...................................................................................3-11
3.3 Demo Mode ............................................................................................3-14
3.3.1 C51 Mode.........................................................................................3-14
3.3.2 C251 Mode.......................................................................................3-15
Section 4
Bill of Material .....................................................................................4-16
Section 5
Schematics .........................................................................................5-18

Introduction
C51 Microcontrollers Demo Board User Guide 1-2
4119C–8051–3/03
Section 1
Introduction
The C51/C251 Demo Board allows easy evaluation of most of Atmel C51/C251 devices.
The C51/C251 Demo Board can be powered using a simple 9V battery or using a 9V
rechargeable battery. The C51/C251 Demo Board can also be used as programming
tool for Flash products.
1.1 Package
Contents
nOne PCB C51/C251 Demo Board (with battery connector)
nOne Serial cable (1.8m length)
Figure 1-1. C51/C251 Demo Board
1.2 On-line Utilities The following utilies involved in using the C51/C251 Demo Board are available on the
Atmel Web site http://www.atmel.com.
Search for DEMOBOARD1.
nFLIP: In-System Programming (ISP) software for Flash microcontrollers
nISP Demo Board Source and Code to program external Flash memory
nSource and Code of demo software

Introduction
1-3 C51 Microcontrollers Demo Board User Guide
4119C–8051–3/03
1.3 Support Questions can be sent to: [e-mail]
1.4 Demo Board
Features
nAn LCD Display (2 lines of 16 characters)
nAn Eight LED Bar Graph
n128 KB Flash Memory
nThree Different Sockets: PLCC44, PLCC68 & DIL24
nIn-System Programming (ISP) Software to Download HEX Files in Flash Memory
nHardware Capability to Program the Microcontrollers On-Chip Flash Memory
nExtension Connectors for Special Features, Applications, New Products, or Demos

Hardware Description
C51 Microcontrollers Demo Board User Guide 2-4
4119C–8051–3/03
Section 2
Hardware Description
2.1 Block Diagram
Figure 2-1. Block Diagram
2.2 Specifications
2.3 Supported
Microcontrollers Most Atmel C51 and C251 microcontrollers are supported.
The Demo Board does not support low voltage parts, only 5V parts are supported.
Reset & INT1#
Power
interface
RS232
C51/C251 LCD 2*16
Bargraph
Config switches
128 K Flash memory Glue
Synchro connectors
To All Extensions
connector
Parameter Typ Max Unit
Supply DC voltage 9 12 V
Supply DC current 200 mA
Consumption at 12 MHz 60 100 mA
Consumption at 60 MHz in X2 mode 110 150 mA
non-rechargeable battery capacity 550 mAh
Rechargeable battery capacity 150 mAh

Hardware Description
2-5 C51 Microcontrollers Demo Board User Guide
4119C–8051–3/03
2.4 Board Supply
Considerations
nPower connector J1 or battery connector J2 may be used to power the board.
nOn J2 connector a rechargeable battery or a non-rechargeable battery may be used.
nIn case of rechargeable battery usage on J2, if J18 is ON the battery is charged when
the board is powered by J1.
nBoard may be powered by J2 for about 10 hours with one new non-rechargeable
battery.
Note: J18 must be Off, when the board is powered by J1with a non-rechargeable
battery connected on J2 (see figure 3).
Figure 2-2. C51/C251 Demo Board powered by J1 with a non-rechargeable battery on J2
Figure 2-3. C51/C251 Demo Board powered by J1 with a rechargeable battery on J2
J1 Power Supply Connector
9V to 12V DC IN
J18
9V
PP3
J2
OFF
non-rechargeable
battery
AC-DC
LCD display
LCD display
J1 Power Supply Connector
9V to 12V DC IN
J18
9V
PP3
J2
ON
battery is being charged
In this configuration
rechargeable
battery
AC-DC

Hardware Description
C51 Microcontrollers Demo Board User Guide 2-6
4119C–8051–3/03
Figure 2-4. C51/C251 Demo Board Powered by J2.
2.5 Board Layout nOn-Off
–Switches ON the power supply.
nReset
–Resets the microcontrollers.
nINT1#
–Issues an interruption on microcontollers on INT1# pin.
nJ8 Connector
–Configure hardware in Page Mode or Non Page Mode.
–for C251 microcontrollers. For C51 products, the configuration must be set to
Non Page Mode.
nSynchro IN
–Used to connect several C51/C251 Demo Boards together, provides global
reset / interrupt for all connected C51/C251 Demo Boards.
nSynchro OUT
–Only one power supply is needed but it may be able to deliver enough
current to supply all the C51/C251 Demo Boards.
–There are no rules to connect two boards together anyone of the two DB9
may be used.
nRS232
–Used to connect a terminal or through an RS232 serial communication port.
–This serial port can be used for displaying messages or for programming
external Flash memory.
Note: The cable that connect this RS232 Connector MUST be a pin to pin cable.
J18
ON
J1 Power Supply Connector
9V
PP3
J2
battery
NOT USED
(rechargeable or not)
LCD display

Hardware Description
2-7 C51 Microcontrollers Demo Board User Guide
4119C–8051–3/03
Figure 2-5. C51/C251 Demo Board
2.6 J11 Switches Table 1. J11 Switches
(Set=1, Clear=0)
J11
J9
J16
RS232 Cable to Terminal
J8
J8
LCD CTRST
+
RESET
INT1
OFF
ON
J17
R21
Page Mode
Non Page Mode
Synchro IN Synchro OUT
RS232
LCD
11
1
X2
X3
X1
PLCC44
PLCC68
DIL24
Extension connector
76543210
ISP ALE PSEN UC4 UC3 UC2 UC1 UC0
Bit
Number Bit Mnemonic Description
7ISP1
In-System Programming (external Flash memory)
Set to enable external Flash memory programming
Clear to protect external Flash memory from erasure and programming
6ALE
Address Latch Enable
Set to see ALE activity
Clear to ground ALE
5PSEN
Program Store Enable
Set to run demos
Clear to program T89C51RD2 on-chip Flash memory
4-0 UC4:0 User Code
Free of use as data input for demos.