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MC6809-MC6809E 8-Bit Microprocessor Programming Manual [M6809PM/AD]
© Motorola Inc., 1981
APPENDIX E - ASCII CHARACTER SET
PDF pages 207-210
E.1 INTRODUCTION
This appendix contains the standard 112 character ASCII character set (7-bit code).
E.2 CHARACTER REPRESENTATION AND CODE IDENTIFICATION
The ASCII character set is given in Figure E-1.
| b7 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 0 | 1 | 1 | 1 | 0 | 0 | 1 | 0 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| b6 | |||||||||||||||||||||||||||||||
| b5 | |||||||||||||||||||||||||||||||
| b4 ↓ |
b3 ↓ |
b2 ↓ |
b1 ↓ |
Column | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | |||||||||||||||||||
| Row | Hex | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | ||||||||||||||||||||||
| 0 | 0 | 0 | 0 | 0 | 0 | NUL | DLE | SP | 0 | @ | P | ` | p | ||||||||||||||||||
| 0 | 0 | 0 | 1 | 1 | 1 | SOH | DC1 | ! | 1 | A | Q | a | q | ||||||||||||||||||
| 0 | 0 | 1 | 0 | 2 | 2 | STX | DC2 | " | 2 | B | R | b | r | ||||||||||||||||||
| 0 | 0 | 1 | 1 | 3 | 3 | ETX | DC3 | # | 3 | C | S | c | s | ||||||||||||||||||
| 0 | 1 | 0 | 0 | 4 | 4 | EOT | DC4 | $ | 4 | D | T | d | t | ||||||||||||||||||
| 0 | 1 | 0 | 1 | 5 | 5 | ENQ | NAK | % | 5 | E | U | e | u | ||||||||||||||||||
| 0 | 1 | 1 | 0 | 6 | 6 | ACK | SYN | & | 6 | F | V | f | v | ||||||||||||||||||
| 0 | 1 | 1 | 1 | 7 | 7 | BEL | ETB | ' | 7 | G | W | g | w | ||||||||||||||||||
| 1 | 0 | 0 | 0 | 8 | 8 | BS | CAN | ( | 8 | H | X | h | x | ||||||||||||||||||
| 1 | 0 | 0 | 1 | 9 | 9 | HT | EM | ) | 9 | I | Y | i | y | ||||||||||||||||||
| 1 | 0 | 1 | 0 | 10 | A | LF | SUB | * | : | J | Z | j | z | ||||||||||||||||||
| 1 | 0 | 1 | 1 | 11 | B | VT | ESC | + | ; | K | [ | k | { | ||||||||||||||||||
| 1 | 1 | 0 | 0 | 12 | C | FF | FS | , | < | L | \ | l | | | ||||||||||||||||||
| 1 | 1 | 0 | 1 | 13 | D | CR | GS | - | = | M | ] | m | } | ||||||||||||||||||
| 1 | 1 | 1 | 0 | 14 | E | SO | RS | . | > | N | ^ | n | ~ | ||||||||||||||||||
| 1 | 1 | 1 | 1 | 15 | F | SI | US | / | ? | O | _ | o | DEL | ||||||||||||||||||
Each 7-bit character is represented with bit seven as the high-order bit and bit one as the low-order bit as shown in the following example:
| b7 | b6 | b5 | b4 | b3 | b2 | b1 | b0 |
| 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
The bit representation for the character "A" is developed from the bit pattern for bits seven through five found above the column designated 4 and the bit pattern for bits four through one found to the left of the row designated 1.
A hexadecimal notation is commonly used to indicate the code for each character. This is easily developed by assuming a logic zero in the non-existant bit eight position for the column numbers and using the hexadecimal number for the row numbers.
E.3 CONTROL CHARACTERS
The characters located in columns zero and one of Figure E-1 are considered control characters. By definition, these are characters whose occurrance in a particular context initiates, modifies, or stops an action that affects the recording, processing, transmission, or interpretation of data. Table E-1 provides the meanings of the control characters.
| Mnemonic | Meaning |
|---|---|
| NUL | Null |
| SOH | Start of Heading |
| STX | Start of Text |
| ETX | End of Text |
| EOT | End of Transmission |
| ENQ | Enquiry |
| ACK | Acknowledge |
| BEL | Bell |
| BS | Backspace |
| HT | Horizontal Tabulation |
| LF | Line Feed |
| VT | Vertical Tabulation |
| FF | Form Feed |
| CR | Carriage Return |
| SO | Shift Out |
| SI | Shift In |
| DLE | Data Link Escape |
| DC1 | Device Control 1 |
| DC2 | Device Control 2 |
| DC3 | Device Control 3 |
| DC4 | Device Control 4 |
| NAK | Negative Acknowledge |
| SYN | Synchronous Idle |
| ETB | End of Transmission Block |
| CAN | Cancel |
| EM | End of Medium |
| SUB | Substitute |
| ESC | Escape |
| FS | File Separator |
| GS | Group Separator |
| RS | Record Separator |
| US | Unit Separator |
| DEL | Delete |
E.4 GRAPHIC CHARACTERS
The characters in columns two through seven are considered graphic characters. These characters have a visual representation which is normally displayed or printed. These characters and their names are given in Table E-2.
| Symbol | Name |
|---|---|
| SP | Space (Normally Nonprinting) |
| ! | Exclamation Point |
| " | Quotation Marks (Diaeresis) |
| # | Number Sign |
| $ | Dollar Sign |
| % | Percent Sign |
| & | Ampersand |
| ' | Apostrophe (Closing Single Quotation Mark; Acute Accent) |
| ( | Opening Parenthesis |
| ) | Closing Parenthesis |
| * | Asterisk |
| + | Plus |
| , | Comma (Cedilla) |
| - | Hyphen (Minus) |
| . | Period (Decimal Point) |
| / | Slant |
| 0...9 | Digits 0 Through 9 |
| : | Colon |
| ; | Semicolon |
| < | Less Than |
| = | Equals |
| > | Greater Than |
| ? | Question Mark |
| @ | Commercial At |
| A...Z | Uppercase Latin Letters A Through Z |
| [ | Opening Bracket |
| \ | Reverse Slant |
| ] | Closing Bracket |
| ^ | Circumflex |
| _ | Underline |
| ` | Opening Single Quotation Mark (Grave Accent) |
| a...z | Lowercase Latin Letters a Through z |
| { | Opening Brace |
| | | Vertical Line |
| } | Closing Brace |
| ~ | Tilde |
© Motorola Inc., 1981 (now Freescale as of 2006)
Transformed into HTML by Matthias "Maddes" Bücher in 2006, 2007, 2023.
Maintained by the M6809 Docs team in 2024.
Use all information at your own risk.
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