AT80C51RD2-RLTIM Atmel, AT80C51RD2-RLTIM Datasheet - Page 73

• Manufacturer Part Number: AT80C51RD2-RLTIM
• Description: IC MCU 8051 5V SPI 20MHZ 44-VQFP
• Manufacturer: Atmel
• Series: 80Cr

Specifications of AT80C51RD2-RLTIM

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 32
• Program Memory Type: ROMless
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-TQFP, 44-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -

17.3.11
17.3.12
70
AT80C51RD2
Float Waveforms
Clock Waveforms
For timing purposes as port pin is no longer floating when a 100 mV changes from load voltage
occurs and begins to float when a 100 mV change from the loaded V
≥ ± 20 mA.
Valid in normal clock mode. In X2 mode XTAL2 must be changed to XTAL2/2.
V
V
OH
OL
+ 0.1 V
- 0.1 V
FLOAT
V
LOAD
V
V
LOAD
LOAD
+ 0.1 V
- 0.1 V
OH
/V
OL
level occurs. I
4113D–8051–01/09
OL
/I
OH