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

• Manufacturer Part Number: AT89C2051-12SC
• Manufacturer: Atmel

Specifications of AT89C2051-12SC

• Cpu Family: 89C
• Device Core: 8051
• Device Core Size: 8b
• Frequency (max): 12MHz
• Interface Type: UART
• Program Memory Type: Flash
• Program Memory Size: 2KB
• Total Internal Ram Size: 128Byte
• # I/os (max): 15
• Number Of Timers - General Purpose: 2
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 6V
• Operating Supply Voltage (min): 2.7V
• Instruction Set Architecture: CISC
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 20
• Package Type: SOIC
• Lead Free Status / Rohs Status: Not 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