Sunday, August 31, 2008

8-BIT Microcontroller

Features
· Compatible with MCS-51 Products · 4 Kbytes of In-System Reprogrammable Flash Memory
Endurance: 1,000 Write/Erase Cycles · Fully Static Operation: 0 Hz to 24 MHz · Three-Level Program Memory Lock · 128 x 8-Bit Internal RAM · 32 Programmable I/O Lines · Two 16-Bit Timer/Counters · Six Interrupt Sources · Programmable Serial Channel · Low Power Idle and Power Down Modes

Pin Configurations PDIP/Cerdip
Description
The AT89C51 is a low-power, high-performance CMOS 8-bit microcomputer with 4
Kbytes 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-51Ô instruction set and pinout.
The on-chip Flash allows the program memory to be reprogrammed in-system or by
a conventional nonvolatile memory programmer. By combining a versatile 8-bit CPU
with Flash on a monolithic chip, the Atmel AT89C51 is a powerful microcomputer
which provides a highly flexible and cost effective solution to many embedded control
applications.

The AT89C51 provides the following standard features: 4
Kbytes of Flash, 128 bytes of RAM, 32 I/O lines, two 16-bit
timer/counters, a five vector two-level interrupt architecture,
a full duplex serial port, on-chip oscillator and clock
circuitry. In addition, the AT89C51 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.

When the AT89C51 is executing code from external program
memory, PSEN is activated twice each machine cycle,
except that two PSEN activations are skipped during
each access to external data memory.
EA/VPP
External Access Enable. EA must be strapped to GND in
order to enable the device to fetch code from external program
memory locations starting at 0000H up to FFFFH.
Note, however, that if lock bit 1 is programmed, EA will be
internally latched on reset.
EA should be strapped to VCC for internal program executions.
This pin also receives the 12-volt programming enable
voltage (VPP) during Flash programming, for parts that require
12-volt VPP.
XTAL1
Input to the inverting oscillator amplifier and input to the
internal clock operating circuit.
XTAL2
Output from the inverting oscillator amplifier.

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