AT89LV55_06 Datasheet, PDF (1/32 Pages) ATMEL Corporation – 8-bit Microcontroller with 20K Bytes Flash

Features
• Compatible with MCS^®-51 Products
• 20K Bytes of Reprogrammable Flash Memory
– Endurance: 1,000 Write/Erase Cycles
• Fully Static Operation: 0 Hz to 12 MHz
• Three-level Program Memory Lock
• 256 x 8-bit Internal RAM
• 32 Programmable I/O Lines
• Three 16-bit Timer/Counters
• Eight Interrupt Sources
• Low-power Idle and Power-down Modes
• 2.7V to 6.0V Operating Range
1. Description
The AT89LV55 is a low-voltage, low-power CMOS 8-bit microcontroller with 20K bytes
of Flash programmable and erasable read-only memory. The device is manufactured
using Atmel’s high-density nonvolatile memory technology and is compatible with the
industry-standard 80C51 instruction set and pinout. The on-chip Flash allows the pro-
gram memory to be reprogrammed. By combining a versatile 8-bit CPU with Flash on
a monolithic chip, the Atmel AT89LV55 is a powerful microcontroller which provides a
highly-flexible and cost-effective solution to many embedded control applications.
The AT89LV55 provides the following standard features: 20K bytes of Flash,
256 bytes of RAM, 32 I/O lines, three 16-bit timer/counters, a six-vector two-level
interrupt architecture, a full duplex serial port, on-chip oscillator, and clock circuitry. In
addition, the AT89LV55 is designed with static logic for operation down to zero fre-
quency and supports two software selectable power saving modes. The Idle Mode
stops the CPU while allowing the RAM, timer/counters, serial port, and interrupt sys-
tem 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.
The low-voltage option saves power and operates with a 2.7-volt power supply.
8-bit
Microcontroller
with 20K Bytes
Flash
AT89LV55
0811D–MICRO–3/06