Low power consumption (minimum 46uA/MHz), scalability (1KB to 512KBFlash) and high efficiency (maximum 1.6DMIPS/MHz) are the three characteristics that Renesas Electronics has given to the RL78 microcontroller family. The exclusive "Snooze" mode enables true low power consumption. In addition, the on-chip high-precision (±1%) high-speed oscillator, data flash memory that can be repeatedly erased and written 1 million times to support background work, and built-in functions such as temperature sensors and various power interface ports will help reduce system cost and size. .
According to the different application fields, the RL78 microcontroller family is subdivided into four categories: general-purpose applications, LCD applications, special applications, and automotive applications. And today's protagonist will be the star of general-purpose microcontrollers - RL78/G11.
In many people's minds, the so-called general-purpose microcontroller means that it can be used in many applications. However, with the increasing diversification of embedded devices, the functional requirements for microcontrollers in many applications have gradually increased, and it has become a trend to add customized functions to traditional general-purpose microcontrollers.
For example, in order to meet the needs of ultra-low power consumption and ultra-small size for sensor applications, lighting, power supply and many small household appliances, the RL78/G11 microcontroller not only supports very low power consumption (100uA@1MHz) and high-speed 4μs wake-up, Also available in small 3x3mm2WFLGA, 4x4mm2HWQFN and standard 20-pin LSSOP packages, featuring a small 10-25-pin package, small 16KB Flash and rich analog peripherals such as A/D converters, D/A converters, comparators and PGA, can be configured as PGA+ADC+VBGR, PGA+CMP, CMP+DAC/VBGR or PGA+CMP+DAC/VBGR.
But doing just that is not enough. A hallmark innovation in the RL78/G11 microcontroller is the use of direct transfer control (DTC), event link controller (ELC), data operation circuit (DOC), and multiple interrupt flag outputs by Renesas (INTFO) and other intelligent functions, realize the goal of connecting many peripheral devices internally to reduce the CPU usage load and save the overall power consumption.
In the diagram below, the ELC can start the module directly from the event, not through the interrupt controller. While the CPU is in sleep mode (HALT), the ELC can also start the module from an event, thereby reducing power consumption while improving the system hardware response speed
Let's take a look at how to use the DOC and DTC functions. DOC and DTC are specially designed to share the CPU load, and its advantage is that both can be used in HALT mode and SNOOZE mode, and no software development is required except initialization routines and ISR. In addition, DTC can transfer 24 sets of control data and 23 trigger sources between various memory addresses (SFR, RAM and Flash) without CPU intervention. Compared with CPU data transfer instructions, DTC's data transfer speed is also faster .
As you can see in the example, the sampled input channel is moved using DTC and controlled by DOC to check for alarm conditions without any CPU intervention. After that, the DTC automatically transfers the ADC results (scan mode) to the SRAM for alarming, the programmable threshold levels stored in the SRAM will be automatically compared/added/decremented by the DOC to check for alarm conditions.
In practical applications, the gas cooker with Renesas' ultra-low-power single-chip microcomputer RL78/G11 as the main control MCU is powered by a 9V dry battery, with sufficient power and long usable time; the gas cooker can be operated by lightly pressing the micro switch. Ignition; high-voltage pulse ignition can ignite the gas faster; the gas detection device can effectively warn the gas leakage to improve safety; the flame temperature detection (thermocouple temperature feedback) can obtain the flame temperature in real time to avoid the flameout caused by the overflow phenomenon ; Anti-dry burning protection device can effectively avoid the occurrence of danger and the waste of gas.
Provides complete hardware and software development tool support for the RL78 family of microcontrollers, including on-chip E1 debugger, E2 debugger, E2-Lite debugger, IECUBE in-circuit emulator, PG-FP5 flash programmer, and e2Studio and CS+ integration Based on the development environment and real-time operating system RTOS, Renesas also provides the RL78/G11 target board for users. The target board has a built-in high-speed oscillator to achieve high-speed operation (@2.7-5.5V), supports flash memory programming and expandable peripheral connection interface, through the in-circuit debugger with E2-Lite/E1/EZ-CUBE programming function, user Simulation operation and chip function test can be performed, and sample code can be downloaded through the EasyGo website.
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