The LM3S6420 microcontroller is based on the ARM Cortex-M3 controller core operating at 25 MHz, with 96 kB single-cycle flash, 32 kB single-cycle SRAM, 10/100 Ethernet MAC/PHY, Systick timer, three 32-bit or six 16-bit general purpose timers, watchdog timer, SSI / SPI controller, two analog comparators, UART, low drop-out voltage regulator, brown-out reset, power-on reset controller, and up to 46 GPIOs.

32-Bit RISC Performance

• 25-MHz operation with 32-bit ARM® Cortex™-M3 architecture
• Thumb®-compatible Thumb-2-only instruction set, with hardware-division and single-cycle-multiplication
• Integrated Nested Vectored Interrupt Controller (NVIC)
• Memory protection unit (MPU)

On-Chip Memory

• 96-KB single-cycle flash
• 32-KB single-cycle SRAM

Flexible Timer Capability

• Three general-purpose timers, each configurable as one 32-bit or two 16-bit timers
• Real-Time Clock (RTC) capability
• 24-bit system (SysTick) timer
• 32-bit watchdog timer

10/100 Ethernet Controller

• Conforms to the IEEE 802.3-2002 Specification
• Full- and half-duplex for both 100-Mbps and 10-Mbps operation
• Integrated 10/100 Mbps Transceiver (PHY)
• Automatic MDI/MDI-X cross-over correction
• Programmable MAC address

Serial Interfaces

• One synchronous serial interfaces (SSI) with master and slave modes for SPI, Microwire, or TI synchronous serial
• One 16C550-type UARTs with IrDA support

Analog Comparators

• Two independent integrated analog comparators
• Configurable for output to: drive an output pin, generate an interrupt, or initiate an ADC sample sequence
• Compare external pin input to external pin input or to internal programmable voltage reference

GPIOs

• Up to forty-six 5-V-tolerant input/outputs
• Programmable interrupt generation
• Fast toggle capable of a change every two clock cycles
• Programmable slew-rate control
• Programmable drive strength

Power

• On-chip Low Drop-Out (LDO) voltage regulator
• 3.3-V supply brown-out detection

Package

• 100-pin RoHS-compliant LQFP
• Industrial operating temperature (-40°C to +85°C)