Atmel C51 Manuale Utente
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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
n
On-Off
–
Switches ON the power supply.
n
Reset
–
Resets the microcontrollers.
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.
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.
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.
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.
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.
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