AT83C5122_08 ATMEL [ATMEL Corporation], AT83C5122_08 Datasheet - Page 56

• Manufacturer Part Number: AT83C5122_08
• Description: C51 Microcontroller with USB and Smart Card Reader Interfaces
• Manufacturer: ATMEL [ATMEL Corporation]

Push-pull Output
Configuration
Input with Medium or Weak
Pull-up Configuration
56
AT83R5122, AT8xC5122/23
The “Port51” is described in Figure 23.
Figure 23. Quasi Bi-directional Port
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
The input with pull-up (Input MPU and Input WPU) configuration is shown in Figure 25.
Port Latch
Data
Input
Data
Port latch
Data
2 CPU
CLOCK DELAY
DPU (AUXR.7)
Strong
N
P
Vss
vcc
NMOS
PMOS
N
P
Strong
Weak
P
vcc
4202F–SCR–07/2008
Medium
P
vcc
Pin
Pin