Rainbow-electronics AT89C5122 Manual do Utilizador descarregar pdf (Página 58)

AT8xC5122/23

4202E–SCR–06/06

The “Port51” is described in Figure 24.

Figure 24. Quasi Bi-directional Port

Push-pull Output

Configuration

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

drain and the quasi-bi-directional output modes, but provides a continuous strong pull-

up when the port latch contains a logic 1. The push-pull mode may be used when more

source current is needed from a port output.

The Push-pull port configuration is shown in Figure 25.

Figure 25. Push-pull Output

Input with Medium or Weak

Pull-up Configuration

The input with pull-up (Input MPU and Input WPU) configuration is shown in Figure 26.

2 CPU

Input

Strong Weak Medium

CLOCK DELAY

Port Latch

Data

DPU (AUXR.7)

Vss

vcc vcc vcc

Strong

Port latch

Data

PMOS

NMOS

1 2 ... 53 54 55 56 57 58 59 60 61 62 63 ... 212 213

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