The Microcontroller Idea Book - Jan Axelson's Lakeview Research

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Chapter 8 Listing 8-4 (page 1 of 2). Initializes a 2-line LCD module and displays a message on each line. 10 REM address of 8255, Port A 20 A=0FC00H 30 REM address of 8255, Port C 40 C=A+2 50 REM address of 8255, Control port 60 X=A+3 70 REM Control word for Enable (PC.5) 80 E=0AH 90 REM Control word for RW (PC.6) 100 RW=0CH 110 REM Control word for RS (PC.4) 120 RS=8 130 REM Initialize LCD module 140 REM initial values 150 XBY(X)=80H: REM Ports A,B,&C are outputs 160 XBY(X)=E : REM E=1 170 XBY(X)=RW : REM RW=1 180 XBY(X)=RS : REM RS=1 190 REM function set: 8-bit interface, 3 times 200 REM toggle E after each instruction 210 XBY(A)=30H 220 XBY(X)=E+1:XBY(X)=E 230 XBY(A)=30H 240 XBY(X)=E+1:XBY(X)=E 250 XBY(A)=30H 260 XBY(X)=E+1:XBY(X)=E 270 REM function set to match module 280 XBY(A)=38H 290 XBY(X)=E+1:XBY(X)=E 300 REM display on 310 XBY(A)=0CH 320 XBY(X)=E+1:XBY(X)=E 330 REM clear display 340 XBY(A)=01H 350 XBY(X)=E+1:XBY(X)=E 360 REM entry mode set 370 XBY(A)=06H 380 XBY(X)=E+1:XBY(X)=E 146 The Microcontroller Idea Book
Displays Listing 8-4 (page 2 0f 2). 390 REM display “LINE 1", ”LINE 2" 400 D=ASC(L):GOSUB 800 410 D=ASC(I):GOSUB 800 420 D=ASC(N):GOSUB 800 430 D=ASC(E):GOSUB 800 440 D=20H:GOSUB 800 450 D=ASC(1):GOSUB 800 460 I=0C0H 470 GOSUB 900 480 D=ASC(L):GOSUB 800 490 D=ASC(I):GOSUB 800 500 D=ASC(N):GOSUB 800 510 D=ASC(E):GOSUB 800 520 D=20H:GOSUB 800 530 D=ASC(2):GOSUB 800 600 END 790 REM write data to the display 800 XBY(X)=RS+1 810 XBY(X)=RW 820 XBY(A)=D 830 XBY(X)=E+1:XBY(X)=E 840 RETURN 890 REM write an instruction to the display 900 XBY(X)=RS 910 XBY(A)=I 920 XBY(X)=E+1:XBY(X)=E 930 RETURN The Microcontroller Idea Book 147
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The Microcontroller Idea Book Circu
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Table of Contents Chapter 1 Microco
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Chapter 11 Control Circuits 185 Swi
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Introduction Introduction This book
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A chapter on assembly-language inte
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Microcontroller Basics 1 Microcontr
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But along with cheap, powerful, and
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makes sense. For simpler designs, a
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Microcontroller Basics Several tech
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Interpreters and compilers are two
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Inside the 8052-BASIC 2 Inside the
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Inside the 8052-BASIC • You can a
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hardware manuals. For programming,
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Inside the 8052-BASIC Figure 2-2 Pi
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Inside the 8052-BASIC Table 2-2. (p
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Inside the 8052-BASIC Code and data
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Powering Up 3 Powering Up This chap
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Powering Up Table 3-1. Parts list f
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Powering Up Figure 3-2. Truth table
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Powering Up Jumper J3 chooses the c
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Powering Up Figure 3-3. This is the
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Powering Up Construction Tips These
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Powering Up Serial Connectors Conne
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You’re now ready to power up the
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Powering Up PRINT XTAL Line Editing
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Powering Up PORT 1 Bit Values: Bit
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Powering Up Listing 3-3. Allows use
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10 CLOCK 1:TIME=0:SEC=0 20 A=0 30 P
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Saving Programs 4 Saving Programs I
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guaranteed for at least ten years.
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Saving Programs Figure 4-3. Circuit
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Jumper J4 is optional. It enables y
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memory on bootup. This is what allo
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This is the recommended algorithm f
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Saving Programs Figure 4-5. Additio
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problems with EPROMs that have a 10
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supply. The chip requires an additi
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Programming 5 Programming When you
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Subroutines have two advantages. Fi
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Programming • Hexadecimal numbers
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Programming It can be hard to find
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Programming Math Operators = + - *
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Programming expression / expression
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Programming DO: [program statements
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Programming LOG(expression) Returns
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Programming PH0.@ Same as PRINT@, b
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Programming RCAP2 Retrieves or assi
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Programming PRINT TAB(2) “hello
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Inputs and Outputs 6 Inputs and Out
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Unassigned space remains in the mem
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U11 is a 74HCT138 3-to-8-line decod
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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: Displays Interfacing Full control o
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 and 174: 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 205 and 206: Control Circuits Listing 11-4. Cont
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Control Circuits Listing 11-5. Cont
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Wireless Links 12 Wireless Links Wi
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Wireless Links Figure 12-2. This in
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Wireless Links Because there are th
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Wireless Links Figure 12-4. The GP1
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through the LEDs. If you prefer an
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Wireless Links Figure 12-6. Using a
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Wireless Links Figure 12-7. Using a
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Wireless Links IREDs emit energy at
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In the infrared link, the amount of
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Calling Assembly-language Routines
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into memory in the 8052-BASIC syste
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2048h in code memory. This is becau
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Binary value 1100 0101 Hex equivale
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Successful assembly is a good sign,
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statement must match the address in
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• BASIC-52’s ON EX1 instruction
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Running BASIC-52 from External Memo
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14-1 for longer delays between writ
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In Figure 3-1, tie pin 31 of U2 (EA
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Related Products 15 Related Product
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Finally, a compiled BASIC program u
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Related Products Figure 15-3. Blue
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Sources Appendix A Sources This App
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Programming and Interfacing the 805
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Sources Product Vendors The followi
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Sources Electronics 123 17921 Rowla
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Sources Micro Future 40944 Cascado
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Sources Siemens Components 2191 Lau
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Programs for Loading Files Appendix
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Programs for Loading Files Listing
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Number Systems Appendix C Number Sy
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Number Systems This table shows the
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Index Index A ADC, 158 - 169 addres
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Index S sample and hold, 169 SBC, 3
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The Microcontroller Idea Book - Jan Axelson's Lakeview Research

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