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H8/3021 Datasheet(PDF) 166 Page - Renesas Technology Corp |
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H8/3021 Datasheet(HTML) 166 Page - Renesas Technology Corp |
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166 / 712 page  7. I/O Ports Rev.2.00 Mar. 22, 2007 Page 142 of 684 REJ09B0352-0200 7.3.4 Input Pull-Up Transistors Port 2 has built-in MOS input pull-up transistors that can be controlled by software. These input pull-up transistors can be turned on and off individually. When a P2PCR bit is set to 1 and the corresponding P2DDR bit is cleared to 0, the input pull-up transistor is turned on. The input pull-up transistors are turned off by a reset and in hardware standby mode. In software standby mode they retain their previous state. Table 7.4 summarizes the states of the input pull-up transistors in each mode. Table 7.4 Input Pull-Up Transistor States (Port 2) Mode Reset Hardware Standby Mode Software Standby Mode Other Modes 1 3 Off Off Off Off 5 6 7 Off Off On/off On/off Legend Off: The input pull-up transistor is always off. On/off: The input pull-up transistor is on if P2PCR = 1 and P2DDR = 0. Otherwise, it is off. |
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