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8-bit Microcontroller with 8K Bytes In-System Programmable ...

8-bit Microcontroller with 8K Bytes In-System Programmable ...

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Port 0 is an 8-bit open drain bidirectional I/O port. As an output port, each pin can sink eight TTL inputs. When 1s are written to port 0 pins, the pins can be used as high-impedance inputs. Port 0 can also be configured to be the multiplexed low-order address/data bus during accesses to external program and data memory.

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