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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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H8S/2240 数据表(PDF) 325 Page - Renesas Technology Corp |
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H8S/2240 数据表(HTML) 325 Page - Renesas Technology Corp |
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325 / 818 page  Section 8 I/O Ports Rev.3.00 Mar. 26, 2007 Page 283 of 772 REJ09B0355-0300 8.14 Handling of Unused Pins Unused input pins should be fixed high or low. Generally, the input pins of CMOS products are high-impedance. Leaving unused pins open can cause the generation of intermediate levels due to peripheral noise induction. This can result in shoot-through current inside the device and cause it to malfunction. Table 8.25 lists examples of ways to handle unused pins. Table 8.25 Examples of Ways to Handle Unused Input Pins Port Name Pin Handling Example Port 1 Connect each pin to Vcc (pull-up) or to Vss (pull-down) via a resistor. Port 2 Port 3 Port 4 Connect each pin to AVcc (pull-up) or to AVss (pull-down) via a resistor. Port 5 Connect each pin to Vcc (pull-up) or to Vss (pull-down) via a resistor. Port A Port B Port C Port D Port E Port F Port G |
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