AT89C5122 ATMEL [ATMEL Corporation], AT89C5122 Datasheet - Page 58

• Manufacturer Part Number: AT89C5122
• Description: MICROCONTROLLER WITH USB AND SMART CARD READER INTERFACES
• Manufacturer: ATMEL [ATMEL Corporation]

Push-pull Output
Configuration
Input with Medium or Weak
Pull-up Configuration
58
AT8xC5122/23
The “Port51” is described in Figure 24.
Figure 24. 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 25.
Figure 25. Push-pull Output
The input with pull-up (Input MPU and Input WPU) configuration is shown in Figure 26.
Port Latch
Data
Input
Data
Port latch
Data
2 CPU
CLOCK DELAY
DPU (AUXR.7)
Strong
P
N
Vss
vcc
NMOS
PMOS
N
P
Strong
Weak
P
vcc
4202D–SCR–06/05
Medium
P
vcc
Pin
Pin