Rainbow-electronics AT89C5122 Manual de usuario descargar pdf (Pagina 59)

AT8xC5122/23

4202E–SCR–06/06

Figure 26. Input with Pull-up

Input with Weak Pull-down

Configuration

The input with pull-down (input WPD) configuration is shown in Figure 27

Figure 27. Input with Pull-down

Low Speed Output

Configuration

The low speed output with low speed t

FALL

and t

RISE

can drive keyboard.

The current limitation of the LED2CTRL block requires a polarisation current of about

250 µA. This block is automatically disabled in power-down mode.

The low speed output configuration (KB_OUT) is shown in Figure 28.

Figure 28. Low-speed Output

LED Source Current The LED configuration is shown in Figure 29.

Input

Data

Weak

Medium

Stuck to 0 if Medium

Stuck to 0 if Weak

Input

Data

Weak

PWEAKCTRL

Port latch

Data

NMOS

PCON.1

Weak

LED2CTRL

1 2 ... 54 55 56 57 58 59 60 61 62 63 64 ... 212 213

Sin comentarios

Rainbow-electronics AT89C5122 Manual de usuario Pagina 59