AT89LP428 datasheet(5/149 Pages) ATMEL

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3654A–MICRO–8/09

AT89LP428/828

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 technol-

ogy 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 exe-

cute 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 preci-

sion pulse width modulation output.

Time r 2 on the AT8 9LP42 8/828 s erve s as a 16- b it tim e ba s e for a 4- ch a nn el

Compare/Capture Array with up to four multi-phasic, variable precision PWM outputs.

The enhanced UART of the AT89LP428/828 includes Framing Error Detection and Automatic

Address Recognition. In addition, enhancements to Mode 0 allow hardware accelerated emula-

tion of half-duplex SPI or 2-wire interfaces.

The I/O ports of the AT89LP428/828 can be independently configured in one of four operating

modes. In quasi-bidirectional mode, the ports operate as in the classic 8051. In input-only mode,

the ports are tristated. Push-pull output mode provides full CMOS drivers and open-drain mode

provides just a pull-down. In addition, all 8 pins of Port 1 can be configured to generate an inter-

rupt using the General-purpose Interrupt (GPI) interface.

AT89LP428 数据表(PDF) 5 Page - ATMEL Corporation

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