参数资料
型号: MC68HC05F4CP
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 1.789 MHz, MICROCONTROLLER, PDIP28
封装: PLASTIC, DIP-28
文件页数: 69/130页
文件大小: 2089K
代理商: MC68HC05F4CP
MC68HC05F4
MOTOROLA
4-5
PARALLEL INPUT/OUTPUT PORTS
4
4.4
Port C
Port C is an 8-bit bidirectional port which does not share any of its pins with other subsystems. All
eight lines have internal pull-up resistors. Port C is not available on the 28-pin package.
Reset does not affect the state of the data register, but clears the data direction register, thereby
returning all port pins to input mode. Writing a ‘1’ to any DDR bit sets the corresponding port pin
to output mode. The port C lines have internal pull-up resistors.
4.5
Port D
Port D is an 8-bit bidirectional port which does not share any of its pins with other subsystems. It
has open drain outputs, which means when a pin is being used as an output, an external pull-up
resistor is required. Port D is not available on the 28-pin package.
Note:
As the voltage at port D is driven above VDD, the protection device will begin to conduct
and tend to clamp the input voltage to protect the input buffer. The voltage at which this
occurs varies signicantly from lot to lot and over the operating temperature range. At
room temperature, the pin typically does not draw any current until approximately 18V.
TPG
39
05F4Book Page 5 Tuesday, August 5, 1997 1:10 pm
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