The Event Link Controller – Automatically Manage Low Level System Tasks on RA MCUs

时间： 2023-01-11 来源：Renesas Blogs

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In this blog, we'll look at another one of the more unusual and less understood peripheRAls available in the RA microcontroller family.

In previous blogs, we looked at two of the peripherals that allow you to create complete autonomous subsystems on a typical RA microcontroller, reducing the CPU demand in your system by automating basic low-level tasks and often saving power consumption, being able to put the CPU to sleep while low-level systems tasks are managed automatically by the hardware. In the past blogs, we looked at the Data Operating Circuit, and the Data Transfer Controller and how we could combine these to automate simple I/O tasks that can operate without CPU intervention, and wake up the CPU when an important event occurs.

In this blog, we'll look at the Event Link Controller (ELC), a peripheral that allows us to directly link peripherals in hardware on RA microcontrollers, so an event such as a timer timing out or an I/O port changing state can be used to trigger the start of an ADC conversion cycle, trigger a timer to start counting or to capture the time of the event. This is all done with a predictable latency, based on the relevant peripheral clocks, so a device can respond to an external event much quicker than using the CPI's interrupt system, and it can also reduce the complexity of the systems software as some events can be handled in hardware rather than relying on an interrupt to be serviced. This can be especially useful in systems with a high interrupt load, where background tasks can almost be completely offloaded from the CPU.

So let's look in a little more detail at how this works. The diagram below shows a greatly simplified diagram of the Event Link Controller. You can see that almost every peripheral on the chip (most of which can be used to generate an interrupt or a DMAC or DTC transfer) can be used to trigger an event inside the Event Link Controller. Each of these events can then be used to trigger an action in a number of the peripherals or to change the state of an I/O pin.

For instance, a timer timing out or an input capture event can be connected to the Analog-to-Digital Converter (ADC) and can start an ADC conversion cycle. The arrival of a message on a serial interface could cause a pin to change state. These events can even be chained together to create more complex interactions directly between the peripherals. This can allow you to automate many low-level events, and by combining some of the peripherals we have already discussed with the ELC, we can create quite complex subsystems, which all can operate without CPU intervention. Each connection in the ELC will occur within 1 – 2 clock cycles of the receiving peripherals clock and does not rely on the CPU to react, so we aren't reliant on the interrupt latency of your application to respond to asynchronous events.

A simple example of using the Event Link Controller is shown below. An external interrupt causes a timer to start after the timer overflows, this then causes the ADC to start conversion. When this system is implemented using interrupts on a traditional microcontroller, three interrupts are required. One for the external interrupt, one for the timer overflow interrupt, and one for the ADC end of conversion, with the resulting CPU overhead and, of course, the software required for each Interrupt Service Routine.

The system will also experience some jitter, especially if the system has many other, often higher priority, interrupts active, or is using an operating system, which may be handling higher priority tasks when one or more of these interrupts occur.

The Event Link Controller can handle the whole function. After the Event Link Controller is initialized, the whole process can be handled automatically without any CPU involvement until the complete process is finished. We can compare the process flow of using the Event Link Controller against the use of interrupts in the next diagram.

In a typical microcontroller application, after each interrupt is generated, we must service each interrupt. This results in a delay and, depending on the software, some jitter. In a microcontroller with the Event Link Controller, each event triggers the next peripheral automatically. The CPU is only interrupted after the ADC conversion has finished.

So in this example, we have almost no jitter, as each peripheral starts 1 – 2 clock cycles after the generating event, and is not affected at all by the condition of the CPU, whether it's handling a priority task or not. We also have additional savings, apart from the initialization, there is no software required for this process, so the code space required for the application can be reduced.

We could also go even further to automate this example and reduce CPU load, by using the DTC. We could automatically transfer the data from the ADC into a buffer in SRAM. Therefore, we could choose to interrupt the CPU perhaps only after every 100 or 200 readings. If we also include some other intelligent functions, such as the Data Operating Circuit, or we decide to use the ADC comparison function, we can go even further, and only interrupt the CPU when a preset analog value is exceeded.

All these features can remove load from the CPU, increase the system response time, make the application software simpler, and often even reduce power consumption.

The combination of the Data Transfer Controller and the Event Link Controller means that many low-level tasks, especially those based around the I/O and timers, can be handled automatically without CPU intervention. This both reduces the load on the CPU and greatly reduces the system's reaction time to external events. You can find more about all these features in the relevant user manuals on our website. The Event Link Controller, like many other peripherals on the RA family microcontrollers, is supported by the RENESAS Free Software Package (FSP).

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本文由Vicky转载自Renesas Blogs，原文标题为:The Event Link Controller – Automatically Manage Low Level System Tasks on RA MCUs，本站所有转载文章系出于传递更多信息之目的，且明确注明来源，不希望被转载的媒体或个人可与我们联系，我们将立即进行删除处理。

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目录- RL78家族特点通用型MCU LCD MCU ASSP 智能模拟汽车开发环境&开发工具解决方案产品一览表封装

型号- R5F104PFAFA,R5F101PHAFB,R5F104PFAFB,R5F10BAFLSP,R5F101PHAFA,R5F113TJLFB,R5F110MEAFB,R5F10JGCAFB,R5F10AACLSP,R5F10AGCLNA,R5F111MHAFB,R5F10WMGAFA,R5F10WMGAFB,R5F101ACASP,R5F104JHAFA,R5F101JJAFA,R5F104BDANA,R5F101BFANA,R5F10PADLSP,R5F1006EASP,R5F101FDAFP,R5F100LJAFA,R5F100LJAFB,R5F100JGAFA,R5F101LCABG,R5F104CFALA,R5F1018CALA,R5F100BCANA,R5F10Y14ASP,R5F100FLAFP,RL78-S2,R5F100EHANA,R5F11MMDAFB,R5F10PGFLFB,R5F100MKAFB,R5F100MKAFA,R5F100CEALA,R5F10BLELFB,R5F100FAAFP,R5F104AAASP,R5F100SJAFB,RL78/F1X,R5F113GLLFB,R5F10BGFLNA,R5F10WLEAFB,R5F104GCAFB,R5F10KGCANA,R5F10WLEAFA,R5F101GCANA,R5F110PJAFB,R5F11BGEAFB,R5F10369ASP,R5F10BMFLFB,R5F100EGANA,R5F113MKLFB,R5F104LJAFP,R5F100GJANA,R5F10278ANA,R5F100MLAFB,R5F1176AGSP,R5F11FLLANA,R5F100FKAFP,R5F100CFALA,R5F10AGELFB,R5F111NGALA,R5F104LJAFA,R5F104LJAFB,R5F10JBCANA,R5F104LHALA,R5F100MLAFA,R5F101SLAFB,R5F101GFAFB,R5F10ALCLFB,R5F10WLFAFB,R5F104BFAFP,R5F104GDAFB,R5F10WLFAFA,R5F11EF8AFP,R5F10PPHLFB,R5F104GLANA,R5F10BGGLNA,R5F1017AANA,R5F10AADLSP,R5F10RFCAFP,R5F110MFAFB,R5F101LLAFA,R5F104JGAFA,R5F104BCANA,R5F1006DASP,R5F10NLE/G,R5F1008AALA,R5F101FEAFP,R5F110NEALA,R5F100AAASP,R5F104GAANA,R5F10RF8AFP,R5F11EAAASP,R5F100JHAFA,R5F10MPEDFB,R5F100BDANA,R5F104CEALA,R5F104MKAFA,R5F10MPGDFB,R5F104MKAFB,R5F10PGELFB,R5F113GKLNA,R5F11MMEAFB,R5F100GLANA,R5F10367ASP,R5F100MJAFA,R5F100MJAFB,R5F10AGGLFB,R5F117BAGFP,R5F10NPJDFB,R5F100LJABG,R5F100GDAFB,R5F104LLAFB,R5F104LLAFA,R5F104LJALA,R5F100SKAFB,R5F101GDANA,R5F10PPJLFB,R5F101PGAFA,R5F10277ANA,R5F10BAELSP,R5F113TKLFB,R5F101PGAFB,R5F101LEABG,R5F10AGDLNA,R5F100GAANA,R5F10NMJ/G,R5F107AEMSP,RL78/G10,R5F101BEANA,RL78/G11,R5F10PMFLFB,RL78/G12,RL78/G13,RL78/G14,R5F101GGAFB,R5F104BEAFP,R5F104FCAFP,R5F101CGALA,R5F100JFAFA,R5F113TLLFB,R5F101LDABG,R5F10BADLSP,R5F11BLCAFB,RL78/G1A,RL78/G1C,RL78/G1D,RL78/G1E,RL78/G1F,RL78/G1G,RL78/G1H,R5F117GAGFB,R5F10BLFLFB,R5F101AAASP,R5F10PMELFB,R5F101BDANA,R5F10RLAAFB,R5F101FFAFP,R5F10AAELSP,R5F10EGAAFB,R5F100BEANA,R5F101CFALA,R5F104FDAFP,R5F10RLAAFA,R5F10Y16ASP,R5F104CDALA,R5F10368ASP,R5F10PGDLFB,R5F104MLAFB,R5F10BMGLFB,R5F11MMFAFB,R5F100GKANA,R5F104MLAFA,R5F101JKAFA,R5F101LCAFA,R5F11768GSP,R5F101LCAFB,R5F100CGALA,R5F10AGFLFB,R5F111NHALA,R5F101GEANA,R5F110PHAFB,R5F100GCAFB,R5F104LKAFB,RL78/F12,RL78/F13,R5F101SKAFB,R5F11B7CANA,R5F11CBCGNA,RL78/F14,R5F104LKAFA,RL78/F15,R5F100SLAFB,R5F1018DALA,R5F104GEAFB,RL78/G1X,R5F10WLGAFA,R5F10WLGAFB,R5F11BGCAFB,R5F101EHANA,R5F101LFABG,R5F104LHAFP,R5F10FMCAFB,R5F10Y46ASP,R5F11BLEAFB,R5F100LCABG,R5F104BGANA,R5F10AGCLFB,R5F10JGCANA,R5F104JEAFA,R5F110PGAFB,R5F104LHAFB,R5F104LHAFA,R5F100PHAFA,R5F100PHAFB,R5F101GHAFB,R5F104LFALA,R5F10PPFLFB,R5F10268ASP,R5F113TGLFB,R5F10BGCLNA,R5F104FJAFP,R5F100JJAFA,R5F113GLLNA,R5F104MJAFA,R5F100ACASP,R5F104MJAFB,R5F10ABDLNA,R5F102A8ASP,R5F1016EASP,R5F101LEAFB,R5F101LEAFA,R5F101PKAFA,R5F101PKAFB,R5F100FDAFP,R5F111NEALA,R5F10PGFLNA,R5F101FGAFP,R5F100GEAFB,R5F10BGFLFB,R5F101MFAFA,R5F104EFANA,R5F101MFAFB,R5F11MPFAFB,R5F100BFANA,R5F104GKAFB,R5F10E8DALA,R5F10AAALSP,RL78/I1A,RL78/I1B,RL78/I1C,RL78/I1D,R5F101LDAFA,RL78/I1E,R5F104ACASP,R5F101LDAFB,R5F101JLAFA,R5F101GFANA,R5F101EGANA,R5F11MPEAFB,R5F104GLAFB,R5F104GAAFB,R5F104LGAFP,R5F10RBAAFP,R5F10WLCAFA,R5F10WLCAFB,R5F111MEAFB,R5F10PGHLFB,R5F113LLLFB,R5F101BCANA,R5F104LGAFB,R5F107ACMSP,R5F104BFANA,R5F10WMDAFB,R5F11CBCMNA,R5F100FCAFP,R5F104LGAFA,R5F10WMDAFA,R5F100PGAFA,R5F100SHAFB,R5F104LEALA,R5F100PGAFB,R5F10PPELFB,R5F101CEALA,R5F10BGDLNA,R5F113THLFB,RL78/I1X,R5F100ADASP,R5F10ABELNA,R5F10WLDAFB,RL78/L1A,R5F100GDANA,R5F11FLJANA,R5F101LFAFB,RL78/L1C,R5F100FEAFP,R5F100EAANA,R5F101LFAFA,R5F10PGELNA,R5F101FHAFP,R5F10BGGLFB,R5F117BAGNA,R5F101CDALA,R5F11MPGAFB,R5F10RLCAFA,R5F104EGANA,R5F10RLCAFB,R5F10WLDAFA,R5F100BGANA,R5F11EFAAFP,R5F100LKAFA,R5F11EA8ASP,R5F111MGAFB,R5F104GJANA,R5F10AGDLFB,R5F10EGCAFB,R5F10WMFAFA,R5F10WMFAFB,RL78/L1E,R5F10MMEDFB,R5F10BLDLFB,R5F111NFALA,R5F101GGANA,R5F11BCEALA,R5F104LGALA,R5F1007EANA,R5F10267ASP,R5F100LKAFB,R5F110PFAFB,R5F104CGALA,R5F10BMELFB,R5F10PPGLFB,RL78/L1X,R5F101EFANA,R5F10PAELSP,R5F100LLAFB,R5F10AGALNA,R5F10PGGLFB,R5F111MFAFB,R5F100LLAFA,R5F104EHANA,R5F104GKANA,R5F102A9ASP,R5F113LKLFB,RY7011A0000DZ00,R5F10EGDAFB,R5F101PJAFA,R5F101PJAFB,R5F10A6ALSP,R5F10KBCAFP,R5F10WMEAFA,R5F104JFAFA,R5F10BLCLFB,R5F117BCGFP,R5F104BEANA,R5F1006CASP,R5F100GFAFB,R5F101GJAFB,R5F10WMEAFB,R5F100PFAFB,R5F101MGAFB,R5F10BGELNA,R5F100PFAFA,R5F10266ASP,R5F10RLAANB,R5F110PEAFB,R5F1018AALA,R5F101MGAFA,R5F100AEASP,R5F10EGAANA,R5F101LGABG,R5F10E8EALA,R5F10FMDAFB,R5F10Y47ASP,R5F104BGAFP,R5F10279ANA,R5F10BAGLSP,R5F113MLLFB,R5F10PGDLNA,R5F100GCANA,R5F111PJAFB,R5F11FLKANA,R5F11BBEAFP,R5F101JCAFA,R5F1026AASP,R5F10RJAAFA,R5F104FAAFP,R5F10NMJDFB,R5F107DEMSP,R5F110NJALA,R5F100MFAFB,R5F100MFAFA,R5F1037AANA,R5F1007CANA,R5F111PGAFB,R5F10A6CLSP,R5F10PMJLFB,R5F100GHAFB,R5F10BBDLNA,R5F10BGCLFB,R5F104GFANA,R5F100LFABG,R5F104MGAFB,R5F104MGAFA,R5F101GHANA,R5F104ECANA,R5F104LEAFP,R5F101EEANA,R5F10RBCAFP,R5F104AFASP,R5F104PKAFB,R5F101BAANA,R5F100GEANA,R5F104LEAFA,RL78/G1,R5F104LEAFB,R5F104FGAFP,R5F101GKAFB,R5F101JEAFA,R5F11BBCAFP,R5

选型指南 - RENESAS - R01CP0003EJ0401 PDF 中文下载

Renesas（瑞萨电子） 32位高性能MCU RH850/D1L,RH850/D1M硬件手册

型号- R7F701405EAFB#AA0,R7F701422EAFB#KA0,R7F701423EAFB#YJ4,RH850/D1L,RH850/D1M,R7F701401,R7F701423,R7F701402,R7F701405EAFB#YB3,R7F701421,R7F701422,R7F701403EAFB#KA0,R7F701405EAFB#YK3,R7F701406EABG#AC0,Y-RH850-D1M1H-PB-DEV-V1,R7F701405,R7F701401EAFB#AA0,R7F701406,R7F701403,R7F701404,R7F701421EAFB#YK2,R7F701403EAFB#AA0,R7F701404EAFB-C#YJ1,R7F701402EAFB#AA0

用户指南 - RENESAS - 2015年05月29日 PDF 英文下载

Renesas Announced 16-bit RL78/G24 MCU Delivers Top-Class Performance for Motor Control and Power Supply Control Systems

RENESAS RL78/G24 features the highest performance among all the devices in the RL78 family, boosting its performance with an application-specific Flexible Application Accelerator (FAA) and a fast CPU that can achieve an operating frequency of 48MHz.

产品发布时间 : 2023-10-08

【经验】基于瑞萨RH850/F1K的MCU 15833 CAN通信中断接收实现注意点

最近有客户在调试基于RH850/F1K的MCU CAN通信功能程序时，一直无法进入中断接收程序；经过查验总结问题所在点，步骤如下：1.在boot.asm文件，如果使用eiint作为表引用方法，启用下一行的宏。

设计经验发布时间 : 2023-03-21

Renesas RL78/G24 16-bit MCU Delivers Performance Comparable to 32-bit MCUs, with a FAA and CPU Operation up to 48MHz

RENESAS RL78/G24 is a general-purpose microcontroller with CPU operation up to 48MHz and a Flexible Application Accelerator (FAA), providing the highest processing power among the RL78 family MCU products.

产品发布时间 : 2023-10-08

16-Bit General-Purpose RL78/G23 MCU with 768KB On-Chip Flash Memory Capacity

April 13, 2021 - Renesas Electronics Corporation announced the launch and the beginning of mass production of its 16-bit general-purpose RL78/G23 microcontroller (MCU). Compatible with Renesas‘ current general-purpose RL78 MCUs, such as the RL78/G13, the RL78/G23 increased the on-chip flash memory capacity to 768KB and substantially expanded on-chip peripheral functions.

新产品发布时间 : 2021-04-29

New MCU RL78/G23 Operates with 30% Lower Power Consumption than The Conventional MCU

The newly released RL78/G23 is the perfect microcontroller (MCU) to satisfy these trends. The RL78/G23 operates with 30% lower power consumption than the conventional RL78 MCUs, which have been well-received for its low power consumption performance.

原厂动态发布时间 : 2021-04-28