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AT83C5103 Datasheet(PDF) 13 Page - ATMEL Corporation

No. de pieza AT83C5103
Descripción Electrónicos  Low-pin Count 8-bit Microcontroller
PDF  64 Pages
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Fabricante Electrónico  ATMEL [ATMEL Corporation]
Página de inicio  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT83C5103 Datasheet(HTML) 13 Page - ATMEL Corporation

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AT8xC5103
4134C–8051–09/04
Figure 3. Quasi-Bi-directional Output
Open Drain Output
Configuration
The open-drain output configuration turns off all pull-ups and only drives the pull-down
transistor of the port driver when the port latch contains a logic 0. To be used as a logic
output, a port configured in this manner must have an external pull-up, typically a resis-
tor tied to VDD. The pull-down for this mode is the same as for the quasi-bi-directional
mode. The open drain port configuration is shown in Figure 4.
Figure 4. Open Drain Output
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 5.
Figure 5. Push-pull Output
2 CPU
Input
Pin
Strong
Very
Weak
N
P
P
Weak
P
Clock Delay
Port latch
Data
Data
Input
Pin
N
Port latch
Data
Data
Input
Pin
Strong
N
P
Port Latch
Data
Data



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