AT89C2051-24PI Atmel, AT89C2051-24PI Datasheet - Page 3

IC MICRO CTRL 24MHZ 20DIP

AT89C2051-24PI

Manufacturer Part Number
AT89C2051-24PI
Description
IC MICRO CTRL 24MHZ 20DIP
Manufacturer
Atmel
Series
89Cr
Datasheet

Specifications of AT89C2051-24PI

Core Processor
8051
Core Size
8-Bit
Speed
24MHz
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)
4 V ~ 6 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
20-DIP (0.300", 7.62mm)
Data Bus Width
8 bit
Data Ram Size
128 B
Interface Type
UART
Maximum Clock Frequency
24 MHz
Number Of Programmable I/os
15
Number Of Timers
2 x 16 bit
Operating Supply Voltage
4 V to 6 V
Maximum Operating Temperature
+ 85 C
Mounting Style
Through Hole
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Data Converters
-
Lead Free Status / Rohs Status
No RoHS Version Available

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4. Pin Description
4.1
4.2
4.3
4.4
4.5
4.6
0368H–MICRO–6/08
VCC
GND
Port 1
Port 3
RST
XTAL1
Supply voltage.
Ground.
The Port 1 is an 8-bit bi-directional I/O port. Port pins P1.2 to P1.7 provide internal pull-ups. P1.0
and P1.1 require external pull-ups. P1.0 and P1.1 also serve as the positive input (AIN0) and the
negative input (AIN1), respectively, of the on-chip precision analog comparator. The Port 1 out-
put buffers can sink 20 mA and can drive LED displays directly. When 1s are written to Port 1
pins, they can be used as inputs. When pins P1.2 to P1.7 are used as inputs and are externally
pulled low, they will source current (I
Port 1 also receives code data during Flash programming and verification.
Port 3 pins P3.0 to P3.5, P3.7 are seven bi-directional I/O pins with internal pull-ups. P3.6 is
hard-wired as an input to the output of the on-chip comparator and is not accessible as a gen-
eral-purpose I/O pin. The Port 3 output buffers can sink 20 mA. When 1s are written to Port 3
pins they are pulled high by the internal pull-ups and can be used as inputs. As inputs, Port 3
pins that are externally being pulled low will source current (I
Port 3 also serves the functions of various special features of the AT89C2051 as listed below:
Port 3 also receives some control signals for Flash programming and verification.
Reset input. All I/O pins are reset to 1s as soon as RST goes high. Holding the RST pin high for
two machine cycles while the oscillator is running resets the device.
Each machine cycle takes 12 oscillator or clock cycles.
Input to the inverting oscillator amplifier and input to the internal clock operating circuit.
Port Pin
P3.0
P3.1
P3.2
P3.3
P3.4
P3.5
Alternate Functions
RXD (serial input port)
TXD (serial output port)
INT0 (external interrupt 0)
INT1 (external interrupt 1)
T0 (timer 0 external input)
T1 (timer 1 external input)
IL
) because of the internal pull-ups.
IL
) because of the pull-ups.
AT89C2051
3

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