 MCBSTR730 User's Guide | |
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MCBSTR730 User's Guide
Introduction Setup Theory of Operation
Block Diagram Schematics Technical Data Prototyping Area Microcontroller Power Supply Configuration JTAG Interface LEDs Push Buttons Potentiometer Speaker Serial Ports CAN Interface Writing Programs Example Programs STR73x Software Library Interrupt FunctionsLEDs
The LEDs on the MCBSTR730 board are:
- A 5V_OK LED shows the DC voltage 5V status. The LED is switched off if the voltage is below its nominal value, or if the reset button is pressed.
- A 2-digit 7-segment LED display
- P0.0 – P0.7 connect to the seven segments A to G and the decimal dot of both digits. Setting the port output to zero switches the appropriate LED segment on.
- P0.8 – P0.9 connect to two transistors that enable the left and the right digit individually. Setting the port output to zero enables the appropriate digit.
- Because of this wiring scheme, a time multiplex method must be used to statically display a 2-digit value on the display.
First, the on/off information for the first digit must be output at port P0.0 – P0.7 together with the enable signal for that digit. This value should be kept stable for some micro seconds.
Then, the on/off information for the second digit must be output together with the enable signal for the second digit. This should be kept stable for the same amount of time.
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