LPC4350_12 Datasheet, PDF (65/149 Pages) NXP Semiconductors – 32-bit ARM Cortex-M4/M0 MCU; up to 264 kB SRAM; Ethernet; two High-speed USBs; advanced configurable peripherals

NXP Semiconductors
LPC4350/30/20/10
32-bit ARM Cortex-M4/M0 microcontroller
7. Functional description
7.1 Architectural overview
The ARM Cortex-M4 includes three AHB-Lite buses: the system bus, the I-CODE bus,
and the D-code bus. The I-CODE and D-code core buses allow for concurrent code and
data accesses from different slave ports.
The LPC4350/30/20/10 use a multi-layer AHB matrix to connect the ARM Cortex-M4
buses and other bus masters to peripherals in a flexible manner that optimizes
performance by allowing peripherals that are on different slaves ports of the matrix to be
accessed simultaneously by different bus masters.
An ARM Cortex-M0 co-processor is included in the LPC4350/30/20/10, capable of
off-loading the main ARM Cortex-M4 application processor. Most peripheral interrupts are
connected to both processors. The processors communicate with each other via an
interprocessor communication protocol.
7.2 ARM Cortex-M4 processor
The ARM Cortex-M4 CPU incorporates a 3-stage pipeline, uses a Harvard architecture
with separate local instruction and data buses as well as a third bus for peripherals, and
includes an internal prefetch unit that supports speculative branching. The ARM
Cortex-M4 supports single-cycle digital signal processing and SIMD instructions. A
hardware floating-point processor is integrated in the core. The processor includes a
NVIC with up to 53 interrupts.
7.3 ARM Cortex-M0 co-processor
The ARM Cortex-M0 is a general purpose, 32-bit microprocessor, which offers high
performance and very low power consumption. The ARM Cortex-M0 co-processor uses a
3-stage pipeline von Neumann architecture and a small but powerful instruction set
providing high-end processing hardware. The co-processor incorporates a NVIC with 32
interrupts.
7.4 Interprocessor communication
The ARM Cortex-M4 and ARM Cortex-M0 interprocessor communication is based on
using shared SRAM as mailbox and one processor raising an interrupt on the other
processor's NVIC, for example after it has delivered a new message in the mailbox. The
receiving processor can reply by raising an interrupt on the sending processor's NVIC to
acknowledge the message.
LPC4350_30_20_10
Objective data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3.1 — 5 January 2012
© NXP B.V. 2012. All rights reserved.
65 of 149