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FS98O22 Datasheet(PDF) 80 Page - Fortune Semiconductor Corp. |
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FS98O22 Datasheet(HTML) 80 Page - Fortune Semiconductor Corp. |
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80 / 146 page  FS98O22 Rev. 1.6 80/146 Table 7-4 PT2 register table Address Name Detail on Chapter Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Value on Power on Reset 24H PT2 7 PT2 [7:0] uuuuuuuu 25H PT2EN 7 PT2EN [7:0] 00000000 26H PT2PU 7 PT2PU [7:0] 00000000 27H PT2MR 7.2/7.5/8 -- PM2EN PM1EN -- -- 00000000 Read data Operation 1. Clear the PT2EN[n] 15 register flags. The PT2[n] will be defined as an input port. 2. Set the PT2PU[n] register as required. The PT2[n] will be connected to an internal pull up resistor. 3. After the signal input from outside, user could get the data through PT2[n] Write data Operation 1. Set the PT2EN[n] register flags. The PT2[n] will be defined as an output port. 2. Set the PT2PU[n] register as required. The PT2[n] will be connected to an internal pull up resistor. 3. Set the PT2[n] to output the data. The embedded D Flip Flop will latch the data till user change PT2[n]. Notice Operation 1. Parallel a small resistor (about 10k ohm) between ports and VDD to increase the possible output current when the PT2PU[n] is set. 7.4. Digital I/O Port or I2C Serial Port : PT2[3]/SDA, PT2[4]/SCL Figure 7-4 PT2[3] PT2[4] function block GPIO Port 2 Bit4 and Bit 3 (PT2[4:3]) function block is shown in Figure 7-4. The main function of the GPIO is input and output data between the Data bus and the ports. Users could control the PT2EN[4:3] register flags to decide the input output direction. The input and output function and the related functions are explained as follows: 15 n means the bits indexes user want to control |
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