Introduction to Microcontrollers Lab Manual - Microchip

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LABS TABLE 9-1: MICROCHIP PIC ® MCU OPERATING MODE OVERVIEW Operating Mode Active Clocks Deep Sleep (1) • Timer1/SOSC • INTRC/LPRC Sleep • Timer1/SOSC • INTRC/LPRC • A/D RC Idle • Timer1/SOSC • INTRC/LPRC • A/D RC Doze (2) Active Peripherals • RTCC • DSWDT • DSBOR • INT0 • RTCC • WDT • ADC • Comparators • CVREF • INTx • Timer1 • HLVD • BOR Wake-up Sources • RTCC • DSWDT • DSBOR • INT0 • MCLR All device wake-up sources (see device data sheet) All Peripherals All device wake-up sources (see device data sheet) All Clocks All Peripherals Software or interrupt wake-up 9.2.6 Reducing Power – Go to Sleep Typical Current Typical Usage < 50 nA • Long life, battery-based applications • Applications with increased Sleep times 50-100 nA Most low-power applications 25% of Run Current 35-75% of Run Current Run All Clocks All Peripherals N/A See device data sheet Note 1: Available on PIC18 and PIC24 devices with nanoWatt XLP Technology only. 2: Available on PIC24, dsPIC ® DSC and PIC32 devices only. Any time the device is waiting for an event to occur (e.g., external or peripheral interrupts) Applications with high-speed peripherals, but requiring low CPU use Normal operation For many embedded systems, most of their operating life is spent waiting for a human to interact with the system (press a button for instance). Until this interaction is detected there is very little for the system to do. These are prime opportunities to go into the Sleep operating mode (i.e., turn off the main clock). Table 9-1 lists INT0 as a possible wake-up source. This means that the system can go into the Deep Sleep Mode (lowest power consumption possible) and still monitor the INT0 input. If the system can be designed such that the human interaction triggers this interrupt, then the system will consume the least amount of dynamic power. DS51963A-page 66 2011 Microchip Technology Inc.
9.3 THE LAB 9.2.7 Microchip XLP Technology As more electronic applications require low power or battery power, energy conservation becomes paramount. Today’s applications must consume little power and, in extreme cases, last for up to 15-20 years, while running from a single battery. To enable applications like these, products with Microchip’s nanoWatt XLP Technology offer the industry's lowest currents for Run and Sleep, where extreme low-power applications spend 90%-99% of their time. Benefits of nanoWatt XLP Technology: • Sleep currents below 20 nA • Brown-out Reset down to 45 nA • Watchdog Timer down to 220 nA • Real-time Clock/Calendar down to 470 nA • Run currents down to 50 µA/MHz • Full analog and self-write capability down to 1.8 Visit www.microchip.com/xlp for more information. 9.3.1 Objective Using the Lab 2 framework, use the power reduction concepts of the pre-lab to reduce the total power consumption of the system. Measure the power consumed to confirm that the changes are effective in reducing power. 9.3.2 Pertinent Information The clock setup is configured in both configuration bits (set during programming and specified in file config_bits_pic24fj256gb110.inc) and control register bits (dynamically set by the application code at run time). If the main clock frequency is changed, then the timer pre-scaler settings may need to change. Use a voltmeter to measure the voltage across the input power measurement resistor (R32). This is a 0.1 Ohm resistor, and by using the equation P = VI, the total current consumed can be calculated. Do this for the project before and after the power consumption changes are made and record your results. 2011 Microchip Technology Inc. DS51963A-page 67
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Introduction to Microcontrollers La
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INTRODUCTION INTRODUCTION TO MICROC
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0.1 OBJECTIVE 0.2 PRE-LAB Lab 0. In
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0.3 THE LAB 0.2.5 I/O Ports The abi
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0.3.5 Programming the Device In ord
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1.1 OBJECTIVE 1.2 PRE-LAB Lab 1. Ti
Page 15 and 16: Setup the Simulator processor frequ
Page 17 and 18: FIGURE 1-3: LAB 1 BASIC PROGRAM FLO
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Page 27 and 28: 3.2.4 I/O Ports with Peripheral Pin
Page 29 and 30: For example: Mapping Action Map “
Page 31 and 32: 3.3 THE LAB 3.3.1 Objective Program
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Page 35 and 36: 4.3 THE LAB 4.2.4 Configuration Bit
Page 37 and 38: 5.1 OBJECTIVE 5.2 PRE-LAB Lab 5. Co
Page 39 and 40: FIGURE 5-4: LAB 5 COMPARATOR VOLTAG
Page 41 and 42: FIGURE 5-5: LAB 5 BASIC PROGRAM FLO
Page 43 and 44: 6.1 OBJECTIVE 6.2 PRE-LAB Lab 6. An
Page 45 and 46: To configure the A/D module, the fo
Page 47 and 48: 6.3 THE LAB The first code transiti
Page 49 and 50: FIGURE 6-5: LAB 6 PROGRAM FLOW The
Page 51 and 52: 7.1 OBJECTIVE 7.2 PRE-LAB Lab 7. Pu
Page 53 and 54: FIGURE 7-3: OUTPUT COMPARE BLOCK DI
Page 55 and 56: LEDs are on the following ports: LE
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Page 59 and 60: 8.2.7 Serial Peripheral Interface (
Page 61 and 62: 8.3 THE LAB 8.3.1 Objective Write a
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Page 65: FIGURE 9-1: PIC24FJ256GB110 FAMILY
Page 69 and 70: 10.1 OBJECTIVE 10.2 THE LAB Lab 10.
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Page 73 and 74: A.3 STEP THREE: CREATE NEW PROJECT
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