Features
• Compatible with MCS-51™ Products
• 4K Bytes of Reprogrammable Flash Memory
– Endurance: 1,000 Write/Erase Cycles
• 3.0V 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
• Brown-Out Detection
8-Bit
Microcontroller
with 4K Bytes
Flash
Description
The AT89C4051 is a low-voltage, high-performance CMOS 8-bit microcomputer with
4K 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 AT89C4051 is a pow-
erful microcomputer which provides a highly flexible and cost effective solution to
many embedded control applications.
AT89C4051
Preliminary
The AT89C4051 provides the following standard features: 4K 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 AT89C4051 is designed with static logic for opera-
tion 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.
Pin Configuration
PDIP/SOIC
/VPP
Rev. 1001A–02/98
1
ATMEL [ ATMEL ]
