What is interrupt in LPC2148?
In LPC2148 ARM7 Microcontroller, The VIC is a component from ARM prime cell range of modules which is highly optimized interrupt controller. The VIC is used to handle all the on-chip interrupt sources from peripherals. Each interrupt source is connected to the VIC on a fixed channel.
How many external interrupts are there in LPC2148?
There are 16 of these registers (VICVectCntl0 to VICVectCntl15), each controlling a vector IRQ Slot.
What is LPC2148?
The NXP (founded by Philips) LPC2148 is an ARM7TDMI-S based high-performance 32-bit RISC Microcontroller with Thumb extensions 512KB on-chip Flash ROM with In-System Programming (ISP) and In-Application Programming (IAP), 32KB RAM, Vectored Interrupt Controller, Two 10bit ADCs with 14 channels, USB 2.0 Full Speed …
How many PLL are there in LPC2148?
There are two PLL modules in the LPC2141/2/4/6/8 microcontroller. The PLL0 is used to generate the CCLK clock (system clock) while the PLL1 has to supply the clock for the USB at the fixed rate of 48 MHz.
What do you know about interrupt?
In digital computers, an interrupt is a response by the processor to an event that needs attention from the software. An interrupt condition alerts the processor and serves as a request for the processor to interrupt the currently executing code when permitted, so that the event can be processed in a timely manner.
Which Vic has the highest priority?
IRQ interrupt configuration
IRQ interrupt configuration In each VIC, an IRQ interrupt can have a priority ranging from 0 to 15 (priority 0 is the highest priority and 15 is the lowest).
Why PLL is used in LPC2148?
LPC2148 has an on – chip oscillator that operates in coordination with an external crystal oscillator in the range of 1 MHz to 25 MHz. The maximum operating frequency in LPC214X series of MCUs is limited to 60 MHz. Hence, the maximum output of the PLL is 60 MHz.
What are the DML stands for in ARM7TDMI?
What are t, d, m, I stands for in ARM7TDMI? a) Timer, Debug, Multiplex, ICE. b) Thumb, Debug, Multiplier, ICE. c) Timer, Debug, Modulation, IS.
What is Thumb instruction?
The Thumb instruction set is a subset of the most commonly used 32-bit ARM instructions. Thumb instructions are each 16 bits long, and have a corresponding 32-bit ARM instruction that has the same effect on the processor model. Thumb has all the advantages of a 32-bit core: 32-bit address space. 32-bit registers.
When does the LPC2148 microcontroller send an interrupt signal?
Interrupt and ISR in LPC2148 ARM7 Microcontroller Whenever any device needs service of microcontroller, the device notifies the microcontroller by sending interrupt signal. Upon receiving an interrupt signal, the microcontroller stops or interrupt main program flow and saves the address of the next instruction (PC) on the stack pointer (SP).
How to program interrupts for LPC2148 arm 7 MCUs?
This is a Basic Tutorial on Interrupts for LPC2148 ARM 7 MCUs and how to program them for those who are new to interrupts. To start with , first lets see : what interrupts, IRQs and ISRs are. As per wiki : “ An interrupt is a signal sent to the CPU which indicates that a system event has a occurred which needs immediate attention “.
What are the registers associated with the LPC2148 timer?
The below table shows the registers associated with LPC2148 Timer module. Interrupt Register: The IR can be read to identify which of 6 (4-match, 2-Capture) possible interrupt sources are pending.
How many interrupt slots are there in LPC2148?
IMPORTANT: Vectored interrupt controller has 23-vectored interrupt slot out of which 16 slots are used in LPC2148. Every slot has set of registers like control & address register.