When using Capture Inputs we use Timer Block in Normal ‘ Timer Mode‘ or ‘ Counter Mode‘.
This mapping of Capture Channel to pins is as given below: Timer0 These channels are mapped to device pins. capture) of the current value of TC when a signal edge is detected. Using these Capture channels we can take a snapshot(i.e. Capture Channels and Input pinsĮach timer block has 4 Capture Channels (CAPn.0 to CAPn.3, n=Timer number) associated with it. When the timer is used in ‘Counter’ mode, and external signal is used to increment the value of TC. When it reaches its maximum value it gets reset to 0 and hence restarts counting. When Timer is Reset and Enabled, TC is set to 0 and incremented by 1 every ‘PR+1’ clock cycles. TC stores the current value of the count and PR stores a prescalar value. A timer has a Timer Counter(TC) and Prescale Register(PR) associated with it. Each Timer block can be used as a ‘Timer’ or as a ‘Counter’. A quick recap:ĪRM LPC214x MCUs have two 32-bit-Timer blocks. In my previous LPC2148 Timer tutorial we saw how to setup and program the timer module. You can also read the below tutorials.Following the request of some of our readers, in this tutorial we will cover how to program capture mode for timer module of ARM7 LPC2148 microcontroller along with a frequency counter example using capture input. If you want to use FreeRTOS on LPC2148, then please refer FreeRTOS series. In our next tutorial, we will see how to interface the DC motor with LPC2148 (ARM7).
Because those 4 bits are connected to LCD. I’m writing into the Port 0 ’s 4 – 7 bits. So first we need to send first nibble then followed by the second. Here everything is the same except the way of data writing.
In initializing time we have to give 0x28 command. If we want to enable 4-bit mode we have to do small modifications in the normal method. In that time we can use this 4-bit mode and reduce the pin required for the LCD module. So we need to reduce the GPIO as possible. I’m doing one project which requires more hardware (sensors or etc). Then why we are going to 4-bit mode? This is the question that comes to every mind whenever I said 4-bit mode. LCD 4-bit interfacing with LPC2148 IntroductionĨ-bit mode – Using 8 data lines in LCD (totally 8 data lines are there)Ĥ-bit mode – Using only 4 data lines in the LCD moduleĨ-bit mode is already working and that looks awesome. Then only you can understand this strongly. Before we will start I would suggest you to read these topics.
0 kommentar(er)
