Introduction to Microcontrollers Lab Manual - Microchip

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LABS FIGURE 6-1: ADC MODULE DIAGRAM Each ADC module has the following registers that control the behavior of the module. For example, ADC1 has the following registers: • AD1CON1: A/D Control Register 1 • AD1CON2: A/D Control Register 2 • AD1CON3: A/D Control Register 3 • AD1CHS: A/D Input Select Register • AD1PCFGL: A/D Port Configuration Register (Low) • AD1PCFGH: A/D Port Configuration Register (High) • AD1CSSL: A/D Input Scan Select Register DS51963A-page 44 2011 Microchip Technology Inc.
To configure the A/D module, the following steps must be executed: 1. Configure port pins as analog inputs and/or select band gap reference inputs (AD1PCFGL and AD1PCFGH) 2. Select voltage reference source to match expected range on analog inputs (AD1CON2) 3. Select the analog conversion clock to match desired data rate with processor clock (AD1CON3) 4. Select the appropriate sample/conversion sequence (AD1CON1 and AD1CON3) 5. Select how conversion results are presented in the buffer (AD1CON1) 6. Select interrupt rate (AD1CON2) 7. Turn on A/D module (AD1CON1) If interrupts are used, then the following steps must be executed during configuration of the A/D module: 1. Clear the AD1IF bit 2. Select A/D interrupt priority 3. Enable the interrupt; set AD1IE bit 6.2.3 Conversion Time The A/D Converter has a maximum rate at which conversions may be completed. An analog module clock, TAD, controls the conversion timing. The A/D conversion requires 12 clock periods (12 TAD). The A/D clock is derived from the device instruction clock. The period of the A/D conversion clock is software selected using a 6-bit counter. There are 64 possible options for TAD, specified by the ADCS bits in the AD1CON3 register. For correct A/D conversions, the A/D conversion clock (TAD) must be selected to ensure a minimum TAD time of 75 ns. FOSC = 32 MHz TCY = 2/FOSC = 2/32 MHz = 62.5 ns ADCS = (TAD/TCY) – 1 TAD = TCY • (ADCS + 1) For TAD > 75 ns we will require ADCS of at least 1. 6.2.4 Sample Time Figure 6-2 the analog input model of the 10-bit A/D Converter of the PIC24FJ256GB110. FIGURE 6-2: ANALOG INPUT OF THE PIC24FJ256GB110 A/D CONVERTER The total sampling time for the A/D is a function of the holding capacitor charge time. 2011 Microchip Technology Inc. DS51963A-page 45
Page 1 and 2: Introduction to Microcontrollers La
Page 3 and 4: INTRODUCTION TO MICROCONTROLLERS LA
Page 5 and 6: INTRODUCTION INTRODUCTION TO MICROC
Page 7 and 8: 0.1 OBJECTIVE 0.2 PRE-LAB Lab 0. In
Page 9 and 10: 0.3 THE LAB 0.2.5 I/O Ports The abi
Page 11 and 12: 0.3.5 Programming the Device In ord
Page 13 and 14: 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
Page 19 and 20: 2.1 INTERRUPTS 2.2 PRE-LAB 2.1.1 Ob
Page 21 and 22: FIGURE 2-2: LAB 2 PRIMARY AND ALTER
Page 23 and 24: 2.2.3 IDE Concepts Watch Window It
Page 25 and 26: 3.1 OBJECTIVE 3.2 PRE-LAB Lab 3. UA
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
Page 33 and 34: 4.1 OBJECTIVE 4.2 PRE-LAB Lab 4. Wa
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: 6.1 OBJECTIVE 6.2 PRE-LAB Lab 6. An
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
Page 57 and 58: 8.1 OBJECTIVE 8.2 PRE-LAB Lab 8. Ex
Page 59 and 60: 8.2.7 Serial Peripheral Interface (
Page 61 and 62: 8.3 THE LAB 8.3.1 Objective Write a
Page 63 and 64: 9.1 OBJECTIVE 9.2 PRE-LAB Lab 9. Po
Page 65 and 66: FIGURE 9-1: PIC24FJ256GB110 FAMILY
Page 67 and 68: 9.3 THE LAB 9.2.7 Microchip XLP Tec
Page 69 and 70: 10.1 OBJECTIVE 10.2 THE LAB Lab 10.
Page 71 and 72: INTRODUCTION TO MICROCONTROLLERS LA
Page 73 and 74: A.3 STEP THREE: CREATE NEW PROJECT

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