![]() For that, use the ISR macro, and you have to give the vector address here (Figure 9). This is an output compare register A, as shown in Figure 1.Īfter that, go to the ClockAlarm_SM.cpp, and here we must implement the ISR. And after that, keep the value in the OCR1A register. Output compare interrupt enable for register A. Let’s go to the register Timer/Counter1 Interrupt Mask Register, and we will be using the output compare register A. I’m just storing the value in binary.Īnd after that, we have to enable the interrupt for the compare event. Look at Figure 1, I write the register name TCCR1B, and I’m just making those 2 bits as 1 here. That means the main clock we are going to divide, that is, the main clock is clk I/O, which we are going to divide by 256. If we want to stop the counter, then you have to make these bit fields as 0.Īnd you can also use these bit fields to select the Prescaler values. When it is 0? the Timer is disabled, or the Timer/Counter is stopped. Clock Select Bit Descriptionīy default, it will be 0. ![]() So, we are not using input capture let’s keep these 2 bit fields as 0.Īnd after that, 0, 1, 2, bit fields are for clock selection. And 7 and 6 bit fields are something to do with input capture. Table of Waveform Generation Mode Bit Description Here you can configure the Prescaler, and also, you should configure the WGM12 and WGM13 fields.įigure 5. So, that’s why I copy the register name TCCR1A and go to our main.cpp, paste here and make that as 0, as shown in Figure 1. So, we’ll choose 0 for these four bit fields (4, 5, 6, 7, bit fields) because that is to do with the wave generation. I want it to be disconnected that’s why we will select 0 here. These bits are not required because these are used to control the OC1A and OC1B pins. You see Figure 2, Bit5:4 – Compare output mode for Channel B. As per that table, it is confirmed that we have to keep WGM10 and WGM11, these bit fields as 0. WGM12 and WGM13 you get in the next register, so we’ll see that. For that, WGM11 and WGM10, 2 bits must be 0, WGM12 bit must be 1, and WGM13 must be 0. I’m going to keep these bits to represent the CTC mode. You can see that bit 0 and 1, which stands for Waveform Generation mode(WGM), can be used to choose the mode. ![]() Bit 1:0 -WGM11:0:Waveform Generation Mode Because, for example, here, let’s start with the 0th field.įigure 3. Here, you see in Figure 2 that we need not use these bits. ![]() That is TCCR1A – Timer/Counter1 Control Register A. Register Description, TCCR1A Registerįirst, let’s start with the first register of the Timer1 peripheral. To configure the timer in CTC mode, you have to explore the register description. Timer1_setup functionĪs I explained in the previous article, I will be configuring the Timer1 peripheral in CTC mode. In the main.cpp, I just added a function Timer1_setup here, we will configure the Timer1 peripheral of the microcontroller to generate an interrupt for every 100 milliseconds. Power-save Mode: 0.Atmegha328p Timer registers and setup code.Low power consumption mode at 1.8V, 1 MHz and 25☌:.Operating temperature range:40☌ to 85☌.Programming lock available for software security.In System Programming (ISP) by via boot loader. ![]()
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