AT89C5122D-PSTUM Atmel, AT89C5122D-PSTUM Datasheet - Page 56

• Manufacturer Part Number: AT89C5122D-PSTUM
• Description: IC 8051 MCU FLASH 32K 64QFN
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C5122D-PSTUM

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 48MHz
• Connectivity: SmartCard, SPI, UART/USART, USB
• Peripherals: LED, POR, WDT
• Number Of I /o: 46
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-QFN
• For Use With: AT89STK-10 - KIT EVAL APPL MASS STORAGEAT89STK-03 - KIT STARTER FOR MCU AT8XC5122/23
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -

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