 | Author | Message | | | Lily-Lee | | Posted: Wed Jul 30, 2008 2:18 am Post subject: COP8SBR9 pdf information | | | | Joined: 22 May 2008 Posts: 32 | COP8SBR9 pdf information:
9.0 Pin COP8SBR9 Descriptions
The COP8SBR9/SCR9/SDR9 I/O structure enables designers to reconfigure the microcontroller’s I/O functions with a
single instruction. Each individual I/O pin can be independently configured as output pin low, output high, input with
high impedance or input with weak pull-up device. A typical example is the use of I/O pins as the keyboard matrix input lines. The input lines can be programmed with internal weak pull-ups so that the input lines read logic high when the keys are all open. With a key closure, the corresponding input line will read a logic zero since the weak pull-up can easily be overdriven. When the key is released, the internal weak pull-up will pull the input line back to logic high. This eliminates the need for external pull-up resistors. The high current options are available for driving LEDs, motors and speakers. This flexibility helps to ensure a cleaner design, with less external components and lower costs. Below is the general description of all available pins. VCC and GND are the power supply pins. All VCC and GND
pins must be connected. Users of the LLP package are cautioned to be aware that the central metal area and the pin 1 index mark on the bottom of the package may be connected to GND. See figure below:
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