AT89C2051-12PU Atmel, AT89C2051-12PU Datasheet - Page 4

• Manufacturer Part Number: AT89C2051-12PU
• Description: IC 8051 MCU FLASH 2K 20DIP
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C2051-12PU

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 12MHz
• Connectivity: UART/USART
• Peripherals: LED
• Number Of I /o: 15
• Program Memory Size: 2KB (2K x 8)
• Program Memory Type: FLASH
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 6 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 20-DIP (0.300", 7.62mm)
• Package: 20PDIP W
• Device Core: 8051
• Family Name: 89C
• Maximum Speed: 12 MHz
• Operating Supply Voltage: 3.3|5 V
• Data Bus Width: 8 Bit
• Number Of Programmable I/os: 15
• Interface Type: UART
• Number Of Timers: 2
• Processor Series: AT89x
• Core: 8051
• Data Ram Size: 128 B
• Maximum Clock Frequency: 12 MHz
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

4.7
5. Oscillator Characteristics
4
XTAL2
AT89C2051
Output from the inverting oscillator amplifier.
The XTAL1 and XTAL2 are the input and output, respectively, of an inverting amplifier which can
be configured for use as an on-chip oscillator, as shown in
ceramic resonator may be used. To drive the device from an external clock source, XTAL2
should be left unconnected while XTAL1 is driven as shown in
ments on the duty cycle of the external clock signal, since the input to the internal clocking
circuitry is through a divide-by-two flip-flop, but minimum and maximum voltage high and low
time specifications must be observed.
Figure 5-1.
Note:
Figure 5-2.
C1, C2 = 30 pF ± 10 pF for Crystals
Oscillator Connections
External Clock Drive Configuration
= 40 pF ± 10 pF for Ceramic Resonators
Figure
Figure
5-1. Either a quartz crystal or
5-2. There are no require-
0368H–MICRO–6/08