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M58-ZC Datasheet(PDF) 37 Page - Nuvoton Technology Corporation

Part No. M58-ZC
Description  32-BIT MICROCONTROLLER
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Maker  NUVOTON [Nuvoton Technology Corporation]
Homepage  http://www.nuvoton.com
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M58-ZC Datasheet(HTML) 37 Page - Nuvoton Technology Corporation

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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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