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IN89C2051 PDF даташит

Спецификация IN89C2051 изготовлена ​​​​«Integral» и имеет функцию, называемую «8-BIT MICROCONTROLLER».

Детали детали

Номер произв IN89C2051
Описание 8-BIT MICROCONTROLLER
Производители Integral
логотип Integral логотип 

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IN89C2051 Даташит, Описание, Даташиты
IN89C2051
8-BIT MICROCONTROLLER WITH 2K BYTES FLASH
Description
The IN89C2051 is a low-voltage, high-performance CMOS 8-bit microcomputer with
2K Bytes of Flash programmable and erasable read only memory (PEROM). The device is
manufactured using Atmel’s high density nonvolatile memory technology and is compatible
with the industry standard MCS-51™ instruction set. By combining a versatile 8-bit CPU
with Flash on a monolithic chip, the Atmel IN89C2051 is a powerful microcomputer which
provides a highly flexible and cost effective solution to many embedded control
applications.
The IN89C2051 provides the following standard features: 2K Bytes of Flash, 128
bytes of RAM, 15 I/O lines, two 16-bit timer/counters, a five vector two-level interrupt
architecture, a full duplex serial port, a precision analog comparator, on-chip oscillator and
clock circuitry. In addition, the IN89C2051 is designed with static logic for operation down
to zero frequency and supports two software selectable power saving modes. The Idle
Mode stops the CPU while allowing the RAM, timer/counters, serial port and interrupt
system to continue functioning. The Power Down Mode saves the RAM contents but
freezes the oscillator disabling all other chip functions until the next hardware reset.
Features
• Compatible with MCS-51™ Products
• 2K Bytes of Reprogrammable Flash Memory
– Endurance: 1,000 Write/Erase Cycles
• 2.7V to 6V Operating Range
• Fully Static Operation: 0 Hz to 24 MHz
• Two-Level Program Memory Lock
• 128 x 8-Bit Internal RAM
• 15 Programmable I/O Lines
• Two 16-Bit Timer/Counters
• Six Interrupt Sources
• Programmable Serial UART Channel
• Direct LED Drive Outputs
• On-Chip Analog Comparator
• Low Power Idle and Power Down Modes
Pin Configuration
1









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IN89C2051 Даташит, Описание, Даташиты
Block Diagram
IN89C2051
Pin Description
VCC
Supply voltage.
GND
Ground.
Port 1
Port 1 is an 8-bit bidirectional I/O port. Port pins P1.2 to P1.7 provide internal
pullups. P1.0 and P1.1 require external pullups. 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 output buffers can sink 20 mA and can drive LED displays directly.
2









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IN89C2051 Даташит, Описание, Даташиты
IN89C2051
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)IL() because)
of the internal pullups.
Port 1 also receives code data during Flash programming and verification.
Port 3
Port 3 pins P3.0 to P3.5, P3.7 are seven bidirectional I/O pins with internal pullups.
P3.6 is hard-wired as an input to the output of the on-chip comparator and is not
accessible as a general 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 pullups and can be used
as inputs. As inputs, Port 3 pins that are externally being
(pulled low will source current (I)IL() because of the pullups.)
Port 3 also serves the functions of various special features of the IN89C2051 as
listed below:
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)
Port 3 also receives some control signals for Flash programming and verification.
RST
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.
XTAL1
Input to the inverting oscillator amplifier and input to the internal clock operating
circuit.
XTAL2
Output from the inverting oscillator amplifier.
Oscillator Characteristics
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 Figure 1. Either a
quartz crystal or 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 Figure
2. There are no requirements 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.
3










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