STC12LE5616AD datasheet(75/377 Pages) STC

Part #	STC12LE5616AD

Description	Enhanced 8051 Central Processing Unit ,1T per machine cycle, faster 8~12 times than the rate of a standard 8051.

PDF	377 Pages

Scroll/Zoom	100%

Manufacturer	STC [STCmicro Technology Co,.Ltd]

Direct Link	http://www.stcmicro.com/

Logo

75 / 377 page

4.2.4 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 tied to VCC. The input path of the port pin in this

configuration is the same as quasi-bidirection mode.

PORT

LATCH DATA

INPUT

DATA

Open-drain output

4.2.3 Input-only (High-Impedance)Mode

The input-only configuration is a Schmitt-triggered input without any pull-up resistors on the pin.

PORT

INPUT

DATA

Input-only Mode

4.2.2 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 conatins a logic “1”.

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

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

Vcc

PORT

LATCH DATA

INPUT

DATA

Push-pull output

STC12LE5616AD Datasheet(PDF) 75 Page - STCmicro Technology Co,.Ltd