MPC82G516AF 参数 Datasheet PDF下载

10.1.2 Open-Drain Output

The open-drain output configuration turns off all pull-ups and only drives the pull-down transistor of the port pin

when the port register contains a logic “0”. To use this configuration in application, a port pin must have an

external pull-up, typically a resistor tied to VDD. The pull-down for this mode is the same as for the quasi-

bidirectional mode. In addition, the input path of the port pin in this configuration is also the same as quasi-

bidirectional mode.

The open-drain port configuration is shown in Figure 10-2. An open drain port pin also has a Schmitt-triggered

input for noise suppression.

Figure 10-2. Open-Drain Output

10.1.3 Input-Only (High Impedance Input)

The input-only configuration is a Schmitt-triggered input without any pull-up resistors on the pin, as shown in

Figure 10-3.

Figure 10-3. Input-Only

10.1.4 Push-Pull Output

The push-pull output configuration has the same pull-down structure as both the open-drain and the quasi-

bidirectional output modes, but provides a continuous strong pull-up when the port register contains a logic “1”.

The push-pull mode may be used when more source current is needed from a port output. In addition, the input

path of the port pin in this configuration is also the same as quasi-bidirectional mode.

The push-pull port configuration is shown in Figure 10-4. A push-pull port pin also has a Schmitt-triggered input

for noise suppression.

Figure 10-4. Push-Pull Output

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MPC82G516A Data Sheet

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