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<!--I / O Pins and Registers All AVR ports have true Read-Modify-Write functionality when used as general digital I/O ports. This means that the direction of one port pin can be changed without unintentionally changing the direction of any other pin with the SBI and CBI instructions. The same applies for changing drive value ( if configured as output ) or enabling/disabling of pull-up resistors if configured as input ). Port B is an 8-bit bi-directional I/O port. Three I/O memory address locations are allocated for the Port D : Data Register ⌨️ 快捷键说明
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