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M58-ZC Datasheet(PDF) 37 Page - Nuvoton Technology Corporation |
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M58-ZC Datasheet(HTML) 37 Page - Nuvoton Technology Corporation |
37 / 71 page NuMicro ™ M058/M0516BN Datasheet Publication Release Date: Mar. 19, 2012 - 37 - Revision V1.01 6.4 General Purpose I/O 6.4.1 Overview There are 40 General Purpose I/O pins shared with special feature functions in this MCU. The 40 pins are arranged in 5 ports named with P0, P1, P2, P3 and P4. Each port equips maximum 8 pins. Each one of the 40 pins is independent and has the corresponding register bits to control the pin mode function and data The I/O type of each of I/O pins can be software configured individually as input, output, open- drain or quasi-bidirectional mode. The all pins of I/O type stay in quasi-bidirectional mode and port data register Px_DOUT[7:0] resets to 0x000_00FF. Each I/O pin equips a very weakly individual pull-up resistor which is about 110K Ω~300KΩ for V DD is from 5.0V to 2.5V. 6.4.1.1 Input Mode Explanation Set Px_PMD (PMDn[1:0]) to 00b the Px[n] pin is in Input mode and the I/O pin is in tri-state(high impedance) without output drive capability. The Px_PIN value reflects the status of the corresponding port pins. 6.4.1.2 Output Mode Explanation Set Px_PMD (PMDn[1:0]) to 2’b01 the Px[n] pin is in Output mode and the I/O pin supports digital output function with source/sink current capability. The bit value in the corresponding bit [n] of Px_DOUT is driven on the pin. Port Pin Input Data Port Latch Data P N VDD Figure 6-10 Push-Pull Output |
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