General description
The LPC2377/78 microcontrollers are based on a 16-bit/32-bit ARM7TDMI-S CPU with
real-time emulation that combines the microcontroller with 512 kB of embedded
high-speed flash memory. A 128-bit wide memory interface and a unique accelerator
architecture enable 32-bit code execution at the maximum clock rate. For critical
performance in interrupt service routines and DSP algorithms, this increases performance
up to 30 % over Thumb mode. For critical code size applications, the alternative 16-bit
Thumb mode reduces code by more than 30 % with minimal performance penalty.
The LPC2377/78 are ideal for multi-purpose serial communication applications. It
incorporates a 10/100 Ethernet Media Access Controller (MAC), USB full speed device
with 4 kB of endpoint RAM (LPC2378 only), four UARTs, two CAN channels (LPC2378
only), an SPI interface, two Synchronous Serial Ports (SSP), three I2C-bus interfaces, an
I2S-bus interface, and an External Memory Controller (EMC). This blend of serial
communications interfaces combined with an on-chip 4 MHz internal oscillator, SRAM of
32 kB, 16 kB SRAM for Ethernet, 8 kB SRAM for USB and general purpose use, together
with 2 kB battery powered SRAM make this device suited for communication gateways
and protocol converters. Various 32-bit timers, an improved 10-bit ADC, 10-bit DAC, PWM
unit, a CAN control unit, and up to 104 fast GPIO lines with up to 50 edge and up to four
level sensitive external interrupt pins make these microcontrollers suitable for industrial
control and medical systems.

Features and benefits
 ARM7TDMI-S processor, running at up to 72 MHz.
 Up to 512 kB on-chip flash program memory with In-System Programming (ISP) and
In-Application Programming (IAP) capabilities. Flash program memory is on the ARM
local bus for high performance CPU access.
 32 kB of SRAM on the ARM local bus for high performance CPU access.
 16 kB SRAM for Ethernet interface. Can also be used as general purpose SRAM.
 8 kB SRAM for general purpose DMA use; also accessible by the USB.
 Dual Advanced High-performance Bus (AHB) system that provides for simultaneous
Ethernet DMA, USB DMA, and program execution from on-chip flash with no
contention between those functions. A bus bridge allows the Ethernet DMA to access
the other AHB subsystem.
 EMC provides support for static devices such as flash and SRAM as well as off-chip
memory mapped peripherals.
 Advanced Vectored Interrupt Controller (VIC), supporting up to 32 vectored interrupts.
 General Purpose DMA controller (GPDMA) on AHB that can be used with the SSP
serial interfaces, the I2S port, and the Secure Digital/MultiMediaCard (SD/MMC) card
port, as well as for memory-to-memory transfers.
 Serial Interfaces:
 Ethernet MAC with associated DMA controller. These functions reside on an
independent AHB.
 USB 2.0 full-speed device with on-chip PHY and associated DMA controller
(LPC2378 only).
 Four UARTs with fractional baud rate generation, one with modem control I/O, one
with IrDA support, all with FIFO.
 CAN controller with two channels (LPC2378 only).
 SPI controller.
 Two SSP controllers with FIFO and multi-protocol capabilities. One is an alternate
for the SPI port, sharing its interrupt and pins. These controllers can be used with
the GPDMA controller.
 Three I2C-bus interfaces (one with open-drain and two with standard port pins).
 I2S (Inter-IC Sound) interface for digital audio input or output. It can be used with
the GPDMA.
 Other peripherals:
 SD/MMC memory card interface.
 104 General purpose I/O pins with configurable pull-up/down resistors.
 10-bit ADC with input multiplexing among 8 pins.
 10-bit DAC.
 Four general purpose timers/counters with 8 capture inputs and 10 compare
outputs. Each timer block has an external count input.
 One PWM/timer block with support for three-phase motor control. The PWM has
two external count inputs.
 Real-Time Clock (RTC) with separate power pin, clock source can be the RTC
oscillator or the APB clock.
 2 kB SRAM powered from the RTC power pin, allowing data to be stored when the
rest of the chip is powered off.
 WatchDog Timer (WDT). The WDT can be clocked from the internal RC oscillator,
the RTC oscillator, or the APB clock.
 Standard ARM test/debug interface for compatibility with existing tools.
 Emulation trace module supports real-time trace.
 Single 3.3 V power supply (3.0 V to 3.6 V).
 Four reduced power modes: idle, sleep, power-down, and deep power-down.
 Four external interrupt inputs configurable as edge/level sensitive. All pins on Port 0
and Port 2 can be used as edge sensitive interrupt sources.
 Processor wake-up from Power-down mode via any interrupt able to operate during
Power-down mode (includes external interrupts, RTC interrupt, USB activity, Ethernet
wake-up interrupt).
 Two independent power domains allow fine-tuning of power consumption based on
needed features.
 Each peripheral has its own clock divider for further power saving.
 Brownout detect with separate thresholds for interrupt and forced reset.
 On-chip power-on reset.