Atmel C51 User Manual
C51 Microcontrollers Demo Board
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User Guide
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................ ...... ....... ...... ....... ...... ....... ...... ...........................3-1 0
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
C51 Microcontrollers Demo Board User Guide i
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Introduction
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
n One PCB C51/C251 Demo Board (with battery connector)
n One 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.
n FLIP: In-System Programming (ISP) software for Flash microcontrollers
n ISP Demo Board Source and Code to program external Flash memory
n Source and Code of demo software
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Introduction
1.3 Support Questions can be sent to: mcu@atmel.com
1.4 Demo Board Features
n An LCD Display (2 lines of 16 characters)
n An Eight LED Bar Graph
n 128 KB Flash Memory
n Three Different Sockets: PLCC44, PLCC68 & DIL24
n In-System Programming (ISP) Software to Download HEX Files in Flash Memory
n Hardware Capability to Program the Microcontrollers On-Chip Flash Memory
n Extension Connectors for Special Features, Applications, New Products, or Demos
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2.1 Block Diagr am
Figure 2-1. Block Diagram
Hardware Description
Section 2
Hardware Description
Synchro connectors
Reset & INT1#
128 K Flash memory
Power
interface
2.2 Specifications
RS232
C51/C251
Glue
To All
Parameter Typ Max Unit
Config switches
Bargraph
LCD 2*16
Extensions
connector
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
2.3 Supported Microcontrollers
C51 Microcontrollers Demo Board User Guide 2-4
Most Atmel C51 and C251 microcontrollers are supported.
The Demo Board does not support low voltage parts, only 5V parts are supported.
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Hardware Description
2.4 Board Supply Considerations
Figure 2-2. C51/C251 Demo Board powered by J1 with a non-rechargeable battery on J2
n Power connector J1 or battery connector J2 may be used to power the board.
n On J2 connector a rechargeable battery or a non-rechargeable battery may be used.
n In case of rechargeable battery usage on J2, if J18 is ON the battery is charged when
the board is powered by J1.
n Board 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 J1 with a non-rechargeable
battery connected on J2 (see figure 3).
AC-DC
J1 Power Supply Connector
LCD display
J2
J18
9V to 12V DC IN
OFF
non-rechargeable
battery
9V
PP3
Figure 2-3. C51/C251 Demo Board powered by J1 with a rechargeable battery on J2
J1 Power Supply Connector
AC-DC
LCD display
J2
J18
9V to 12V DC IN
ON
rechargeable
battery
2-5 C51 Microcontrollers Demo Board User Guide
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9V
PP3
In this configuration
battery is being charged
Figure 2-4. C51/C251 Demo Board Powered by J2.
J2
battery
(rechargeable or not)
9V
PP3
2.5 Board Layout n On-Off
– Switches ON the power supply.
n
Reset
– Resets the microcontroll ers.
LCD display
J18
ON
Hardware Description
J1 Power Supply Connector
NOT USED
n
INT1#
– Issues an interruption on microcontollers on INT1# pin.
n
J8 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.
n
Synchro IN
– Used to connect several C51/C251 Demo Boards together, provides global
reset / interrupt for all connected C51/C251 Demo Boards.
n
Synchro 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.
n
RS232
– 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.
C51 Microcontrollers Demo Board User Guide 2-6
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