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AT89C5122D-RDRUM Datasheet(PDF) 56 Page - ATMEL Corporation

No. de pieza AT89C5122D-RDRUM
Descripción Electrónicos  C51 Microcontroller with USB and Smart Card Reader Interfaces
PDF  208 Pages
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Fabricante Electrónico  ATMEL [ATMEL Corporation]
Página de inicio  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C5122D-RDRUM Datasheet(HTML) 56 Page - ATMEL Corporation

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56
AT83R5122, AT8xC5122/23
4202F–SCR–07/2008
The “Port51” is described in Figure 23.
Figure 23.
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 24.
Figure 24.
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 25.
2 CPU
Input
Pin
Strong
Weak
Medium
N
P
P
P
CLOCK DELAY
Port Latch
Data
Data
DPU (AUXR.7)
Vss
vcc
vcc
vcc
Pin
Strong
N
P
Port latch
Data
PMOS
NMOS



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