The Microcontroller Idea Book - Jan Axelson's Lakeview Research

More documents

Recommendations

Info

Chapter 9 Figure 9-6. The LM34 and LM35 temperature sensors have outputs of 10 millivolts per degree, and need no calibration. Listing 9-3. Measures and displays temperature reading at ADC0848’s Channel 2. 10 REM set A to address of ADC 20 A=0C000H 30 REM use single-ended mode 40 REM set C to channel to read (1-8) 50 C=2 60 XBY(A)=8+C-1 70 VREF=2.5 80 B=XBY(A) 90 T=INT(VREF*B*100/255+.5) 100 PRINT “Temperature = ”,T 110 PRINT “Press any key to take another measurement” 120 D=GET : IF D=0 THEN GOTO 120 130 GOTO 60 140 END 164 The Microcontroller Idea Book
Using Sensors to Detect and Measure Figure 9-7. The LM385 series of voltage references includes 1.2V, 2.5V, and an adjustable version. Listing 9-3 assumes that an LM34 connects to CH2 on the ADC0848, and that VREF is 2.5V. On request, it displays the current temperature. For a smaller range, create a 1.2V reference with an LM385-1.2 and change line 70 in the program to match. Another option is the LM385 adjustable reference, which contains a reference diode and feedback amplifier. With the addition of a voltage source and resistors in a voltage divider, you can set the LM385’s output to the reference voltage you need. Use the formula shown to vary the resistors for different outputs. Solar Energy Figure 9-8 shows another sensor application, a solar cell that generates a current proportional to the intensity of the light hitting the cell. The output of the solar cell in the example varies The Microcontroller Idea Book 165
Page 1 and 2:
The Microcontroller Idea Book Circu
Page 3 and 4:
Table of Contents Chapter 1 Microco
Page 5 and 6:
Chapter 11 Control Circuits 185 Swi
Page 7 and 8:
Introduction Introduction This book
Page 9 and 10:
A chapter on assembly-language inte
Page 11 and 12:
Microcontroller Basics 1 Microcontr
Page 13 and 14:
But along with cheap, powerful, and
Page 15 and 16:
makes sense. For simpler designs, a
Page 17 and 18:
Microcontroller Basics Several tech
Page 19 and 20:
Interpreters and compilers are two
Page 21 and 22:
Inside the 8052-BASIC 2 Inside the
Page 23 and 24:
Inside the 8052-BASIC • You can a
Page 25 and 26:
hardware manuals. For programming,
Page 27 and 28:
Inside the 8052-BASIC Figure 2-2 Pi
Page 29 and 30:
Inside the 8052-BASIC Table 2-2. (p
Page 31 and 32:
Inside the 8052-BASIC Code and data
Page 33 and 34:
Powering Up 3 Powering Up This chap
Page 35 and 36:
Powering Up Table 3-1. Parts list f
Page 37 and 38:
Powering Up Figure 3-2. Truth table
Page 39 and 40:
Powering Up Jumper J3 chooses the c
Page 41 and 42:
Powering Up Figure 3-3. This is the
Page 43 and 44:
Powering Up Construction Tips These
Page 45 and 46:
Powering Up Serial Connectors Conne
Page 47 and 48:
You’re now ready to power up the
Page 49 and 50:
Powering Up PRINT XTAL Line Editing
Page 51 and 52:
Powering Up PORT 1 Bit Values: Bit
Page 53 and 54:
Powering Up Listing 3-3. Allows use
Page 55 and 56:
10 CLOCK 1:TIME=0:SEC=0 20 A=0 30 P
Page 57 and 58:
Saving Programs 4 Saving Programs I
Page 59 and 60:
guaranteed for at least ten years.
Page 61 and 62:
Saving Programs Figure 4-3. Circuit
Page 63 and 64:
Jumper J4 is optional. It enables y
Page 65 and 66:
memory on bootup. This is what allo
Page 67 and 68:
This is the recommended algorithm f
Page 69 and 70:
Saving Programs Figure 4-5. Additio
Page 71 and 72:
problems with EPROMs that have a 10
Page 73 and 74:
supply. The chip requires an additi
Page 75 and 76:
Programming 5 Programming When you
Page 77 and 78:
Subroutines have two advantages. Fi
Page 79 and 80:
Programming • Hexadecimal numbers
Page 81 and 82:
Programming It can be hard to find
Page 83 and 84:
Programming Math Operators = + - *
Page 85 and 86:
Programming expression / expression
Page 87 and 88:
Programming DO: [program statements
Page 89 and 90:
Programming LOG(expression) Returns
Page 91 and 92:
Programming PH0.@ Same as PRINT@, b
Page 93 and 94:
Programming RCAP2 Retrieves or assi
Page 95 and 96:
Programming PRINT TAB(2) “hello
Page 97 and 98:
Inputs and Outputs 6 Inputs and Out
Page 99 and 100:
Unassigned space remains in the mem
Page 101 and 102:
U11 is a 74HCT138 3-to-8-line decod
Page 103 and 104:
If you wish, you can wire U14’s i
Page 105 and 106:
Inputs and Outputs Figure 6-4. Outp
Page 107 and 108:
Inputs and Outputs Listing 6-2. Set
Page 109 and 110:
The 82C55 also has CMOS-compatible
Page 111 and 112:
Inputs and Outputs Pin Symbol Input
Page 113 and 114:
Inputs and Outputs An 8255 Interfac
Page 115 and 116:
Inputs and Outputs XBY(0FC03h)=9BH
Page 117 and 118:
To set or clear a different bit, de
Page 119 and 120:
Switches and Keypads 7 Switches and
Page 121 and 122:
Switches and Keypads Figure 7-2. Us
Page 123 and 124: exact value depending on the switch
Page 125 and 126: Switches and Keypads Figure 7-4. Tw
Page 127 and 128: Switches and Keypads Figure 7-6. A
Page 129 and 130: Switches and Keypads Custom Keypads
Page 131 and 132: Switches and Keypads • A single c
Page 133 and 134: Switches and Keypads Listing 7-3. T
Page 135 and 136: Displays 8 Displays In addition to
Page 137 and 138: Displays Figure 8-1. LED interfaces
Page 139 and 140: Displays Figure 8-2. Ways to connec
Page 141 and 142: Displays Figure 8-4. Four output po
Page 143 and 144: Displays Figure 8-5. The ICM7218D c
Page 145 and 146: In Figure 8-5’s circuit, an 82(C)
Page 147 and 148: Displays Figure 8-7. With the TC721
Page 149 and 150: Displays Figure 8-8. With a charact
Page 151 and 152: Table 8-1. LCD modules containing t
Page 153 and 154: Each character in the CG ROM and CG
Page 155 and 156: Displays Interfacing Full control o
Page 157 and 158: Displays Listing 8-4 (page 2 0f 2).
Page 159 and 160: Displays Listing 8-5. Displays key
Page 161 and 162: Displays Listing 8-6 (page 2 of 2).
Page 163 and 164: Using Sensors to Detect and Measure
Page 165 and 166: • What power supplies are availab
Page 171 and 172: different ground symbols for the tw
Page 173: 10 REM use single-ended mode 20 REM
Page 181 and 182: Clocks and Calendars 10 Clocks and
Page 183 and 184: Listing 10-1. Uses BASIC-52’s rea
Page 185 and 186: Clocks and Calendars Figure 10-1. P
Page 187 and 188: Clocks and Calendars Table 10-1. Re
Page 189 and 190: If you want an alarm frequency othe
Page 191 and 192: Clocks and Calendars Listing 10-3 (
Page 193 and 194: Clocks and Calendars Listing 10-3 (
Page 195 and 196: Control Circuits 11 Control Circuit
Page 197 and 198: the LSTTL part, and wire the desire
Page 199 and 200: Control Circuits Listing 11-1. Cont
Page 201 and 202: Control Circuits Listing 11-2. Demo
Page 203 and 204: Control Circuits disables the outpu
Page 209 and 210: Wireless Links 12 Wireless Links Wi
Page 211 and 212: Wireless Links Figure 12-2. This in
Page 213 and 214: Wireless Links Because there are th
Page 215 and 216: Wireless Links Figure 12-4. The GP1
Page 217 and 218: through the LEDs. If you prefer an
Page 219 and 220: Wireless Links Figure 12-6. Using a
Page 221 and 222: Wireless Links Figure 12-7. Using a
Page 223 and 224: Wireless Links IREDs emit energy at
Page 225 and 226:
In the infrared link, the amount of
Page 227 and 228:
Calling Assembly-language Routines
Page 229 and 230:
into memory in the 8052-BASIC syste
Page 231 and 232:
2048h in code memory. This is becau
Page 233 and 234:
Binary value 1100 0101 Hex equivale
Page 235 and 236:
Successful assembly is a good sign,
Page 237 and 238:
statement must match the address in
Page 239 and 240:
Page 241 and 242:
Page 243 and 244:
• BASIC-52’s ON EX1 instruction
Page 245 and 246:
Page 247 and 248:
Page 249 and 250:
Running BASIC-52 from External Memo
Page 251 and 252:
14-1 for longer delays between writ
Page 253 and 254:
In Figure 3-1, tie pin 31 of U2 (EA
Page 255 and 256:
Related Products 15 Related Product
Page 257 and 258:
Finally, a compiled BASIC program u
Page 259 and 260:
Related Products Figure 15-3. Blue
Page 261 and 262:
Sources Appendix A Sources This App
Page 263 and 264:
Programming and Interfacing the 805
Page 265 and 266:
Sources Product Vendors The followi
Page 267 and 268:
Sources Electronics 123 17921 Rowla
Page 269 and 270:
Sources Micro Future 40944 Cascado
Page 271 and 272:
Sources Siemens Components 2191 Lau
Page 273 and 274:
Programs for Loading Files Appendix
Page 275 and 276:
Programs for Loading Files Listing
Page 277 and 278:
Page 279 and 280:
Page 281 and 282:
Number Systems Appendix C Number Sy
Page 283 and 284:
Number Systems This table shows the
Page 285 and 286:
Index Index A ADC, 158 - 169 addres
Page 287 and 288:
Index S sample and hold, 169 SBC, 3
show all

The Microcontroller Idea Book - Jan Axelson's Lakeview Research

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?