AT89C5122 ATMEL [ATMEL Corporation], AT89C5122 Datasheet - Page 59

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

Input with Weak Pull-down
Configuration
Low Speed Output
Configuration
LED Source Current
4202D–SCR–06/05
Figure 26. Input with Pull-up
The input with pull-down (input WPD) configuration is shown in Figure 27
Figure 27. Input with Pull-down
The low speed output with low speed t
The current limitation of the LED2CTRL block requires a polarisation current of about
250 µA. This block is automatically disabled in power-down mode.
The low speed output configuration (KB_OUT) is shown in Figure 28.
Figure 28. Low-speed Output
The LED configuration is shown in Figure 29.
Data
Port latch
PCON.1
Input
Data
Input
Data
Stuck to 0 if Medium
Stuck to 0 if Weak
FALL
and t
LED2CTRL
PWEAKCTRL
RISE
can drive keyboard.
NMOS
1
Weak
P
N
P
Weak
N
N
P
Weak
Medium
Pin
Pin
Pin
59