8-bit Microcontroller with 4K/8K Bytes In-System Programmable Flash AT89LP428 AT89LP828

8-bit
Microcontroller
with 4K/8K
Bytes In-System
Programmable
Flash
AT89LP428
AT89LP828

Features
• 8-bit Microcontroller Compatible with MCS®51 Products
• Enhanced 8051 Architecture
– Single-clock Cycle per Byte Fetch
– Up to 20 MIPS Throughput at 20 MHz Clock Frequency
– Fully Static Operation: 0 Hz to 20 MHz
– On-chip 2-cycle Hardware Multiplier
– 256 x 8 Internal RAM
– 512 x 8 Internal Extra RAM
– Dual Data Pointers
– 4-level Interrupt Priority
• Nonvolatile Program and Data Memory
– 4K/8K Bytes of In-System Programmable (ISP) Flash Program Memory
– 512/1024 Bytes of Flash Data Memory
– Endurance: Minimum 100,000 Write/Erase Cycles (for Both
Program/Data Memories)
– Serial Interface for Program Downloading
– 64-byte Fast Page Programming Mode
– 128-byte User Signature Array
– 2-level Program Memory Lock for Software Security
– In-Application Programming of Program Memory
• Peripheral Features
– Three 16-bit Enhanced Timer/Counters
– Two 8-bit PWM Outputs
– 4-channel 16-bit Compare/Capture/PWM Array
– Enhanced UART with Automatic Address Recognition and Framing
Error Detection
– Enhanced Master/Slave SPI with Double-buffered Send/Receive
– Programmable Watchdog Timer with Software Reset
– Dual Analog Comparators with Selectable Interrupts and Debouncing
– 8 General-purpose Interrupt Pins
• Special Microcontroller Features
– 2-wire On-chip Debug Interface
– Brown-out Detection and Power-on Reset with Power-off Flag
– Active-low External Reset Pin
– Internal RC Oscillator
– Low Power Idle and Power-down Modes
– Interrupt Recovery from Power-down Mode
• I/O and Packages
– Up to 30 Programmable I/O Lines
– 28-lead PDIP or 32-lead TQFP/PLCC/MLF
– Configurable I/O Modes
• Quasi-bidirectional (80C51 Style)
• Input-only (Tristate)
• Push-pull CMOS Output
• Open-drain
• Operating Conditions
– 2.4V to 5.5V VCC Voltage Range
– -40°C to 85°C Temperature Range
– 0 to 20 MHz @ 2.4–5.5V
– 0 to 25 MHz @ 4.0–5.5V

Overview
The AT89LP428/828 is a low-power, high-performance CMOS 8-bit microcontroller with 4K/8K
bytes of In-System Programmable Flash program memory and 512/1024 bytes of Flash data
memory. The device is manufactured using Atmel®'s high-density nonvolatile memory technology
and is compatible with the industry-standard MCS51 instruction set. The AT89LP428/828 is
built around an enhanced CPU core that can fetch a single byte from memory every clock cycle.
In the classic 8051 architecture, each fetch requires 6 clock cycles, forcing instructions to execute
in 12, 24 or 48 clock cycles. In the AT89LP428/828 CPU, instructions need only 1 to 4 clock
cycles providing 6 to 12 times more throughput than the standard 8051. Seventy percent of
instructions need only as many clock cycles as they have bytes to execute, and most of the
remaining instructions require only one additional clock. The enhanced CPU core is capable of
20 MIPS throughput whereas the classic 8051 CPU can deliver only 4 MIPS at the same current
consumption. Conversely, at the same throughput as the classic 8051, the new CPU core runs
at a much lower speed and thereby greatly reducing power consumption and EMI.
The AT89LP428/828 provides the following standard features: 4K/8K bytes of In-System
Programmable Flash program memory, 512/1024 bytes of Flash data memory, 768 bytes of
RAM, up to 30 I/O lines, three 16-bit timer/counters, up to six PWM outputs, a programmable
watchdog timer, two analog comparators, a full-duplex serial port, a serial peripheral interface,
an internal RC oscillator, on-chip crystal oscillator, and a four-level, ten-vector interrupt system.
A block diagram is shown in Figure 2-1 on page 6.
Timer 0 and Timer 1 in the AT89LP428/828 are enhanced with two new modes. Mode 0 can be
configured as a variable 9- to 16-bit timer/counter and Mode 1 can be configured as a 16-bit
auto-reload timer/counter. In addition, the timer/counters may independently drive an 8-bit precision
pulse width modulation output.
Timer 2 on the AT89LP428/828 serves as a 16-bit time base for a 4-channel
Compare/Capture Array with up to four multi-phasic, variable precision PWM outputs.

Click here to download ATMEL pdf datasheets 8-bit Microcontroller with 4K/8K Bytes In-System Programmable Flash AT89LP428 AT89LP828

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