Datasheet HD44780U (LCD-II) (Hitachi) - 15
| Hersteller | Hitachi |
| Beschreibung | Dot Matrix Liquid Crystal Display Controller/Driver |
| Seiten / Seite | 60 / 15 — HD44780U. Table 2. Example of Correspondence between EPROM Address Data … |
| Dateiformat / Größe | PDF / 330 Kb |
| Dokumentensprache | Englisch |
HD44780U. Table 2. Example of Correspondence between EPROM Address Data and Character Pattern (5. 8 Dots). EPROM Address. Data
Modelllinie für dieses Datenblatt
Textversion des Dokuments
HD44780U
• Programming character patterns This section explains the correspondence between addresses and data used to program character patterns in EPROM. The HD44780U character generator ROM can generate 208 5 × 8 dot character patterns and 32 5 × 10 dot character patterns for a total of 240 different character patterns. Character patterns EPROM address data and character pattern data correspond with each other to form a 5 × 8 or 5 × 10 dot character pattern (Tables 2 and 3).
Table 2 Example of Correspondence between EPROM Address Data and Character Pattern (5
×
8 Dots) EPROM Address Data
LSB A 1 A 1 1 0 A 9 A 8 A 7 A 6 A 5 A 4 A 3 A 2 A 1 A 0 O 4 O 3 O 2 O 1 O 0 0 0 0 0 1 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 1 0 1 0 1 1 0 0 0 1 1 1 1 0 0 1 0 1 0 0 1 0 0 0 1 0 1 0 1 1 0 0 0 1 0 1 1 0 1 1 1 1 0 0 1 1 0 0 0 1 0 0 1 1 1 0 0 0 0 0 Cursor position 1 0 0 0 0 0 0 0 0 1 0 0 1 0 0 0 0 0 1 0 1 0 0 0 0 0 0 1 0 1 1 0 0 0 0 0 1 1 0 0 0 0 0 0 0 1 1 0 1 0 0 0 0 0 1 1 1 0 0 0 0 0 0 1 1 1 1 0 0 0 0 0 Character code Line position Notes: 1. EPROM addresses A11 to A4 correspond to a character code. 2. EPROM addresses A3 to A0 specify a line position of the character pattern. 3. EPROM data O4 to O0 correspond to character pattern data. 4. EPROM data O5 to O7 must be specified as 0. 5. A lit display position (black) corresponds to a 1. 6. Line 9 and the following lines must be blanked with 0s for a 5 × 8 dot character fonts. 15 Document Outline Description Features Ordering Information HD44780U Block Diagram HD44780U Pin Arrangement (FP-80B) HD44780U Pin Arrangement (TFP-80F) HD44780U Pad Arrangement HD44780U Pad Location Coordinates Pin Functions Function Description Interfacing to the MPU Reset Function Instructions Instruction Description Interfacing the HD44780U Power Supply for Liquid Crystal Display Drive Relationship between Oscillation Frequency and Liquid Crystal Display Frame Frequency Instruction and Display Correspondence Initializing by Instruction Absolute Maximum Ratings DC Characteristics AC Characteristics Bus Timing Characteristics Interface Timing Characteristics with External Driver Power Supply Conditions Using Internal Reset Circuit DC Characteristics AC Characteristics Bus Timing Characteristics Interface Timing Characteristics with External Driver Power Supply Conditions Using Internal Reset Circuit Electrical Characteristics Notes Load Circuits Timing Characteristics
• Programming character patterns This section explains the correspondence between addresses and data used to program character patterns in EPROM. The HD44780U character generator ROM can generate 208 5 × 8 dot character patterns and 32 5 × 10 dot character patterns for a total of 240 different character patterns. Character patterns EPROM address data and character pattern data correspond with each other to form a 5 × 8 or 5 × 10 dot character pattern (Tables 2 and 3).
Table 2 Example of Correspondence between EPROM Address Data and Character Pattern (5
×
8 Dots) EPROM Address Data
LSB A 1 A 1 1 0 A 9 A 8 A 7 A 6 A 5 A 4 A 3 A 2 A 1 A 0 O 4 O 3 O 2 O 1 O 0 0 0 0 0 1 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 1 0 1 0 1 1 0 0 0 1 1 1 1 0 0 1 0 1 0 0 1 0 0 0 1 0 1 0 1 1 0 0 0 1 0 1 1 0 1 1 1 1 0 0 1 1 0 0 0 1 0 0 1 1 1 0 0 0 0 0 Cursor position 1 0 0 0 0 0 0 0 0 1 0 0 1 0 0 0 0 0 1 0 1 0 0 0 0 0 0 1 0 1 1 0 0 0 0 0 1 1 0 0 0 0 0 0 0 1 1 0 1 0 0 0 0 0 1 1 1 0 0 0 0 0 0 1 1 1 1 0 0 0 0 0 Character code Line position Notes: 1. EPROM addresses A11 to A4 correspond to a character code. 2. EPROM addresses A3 to A0 specify a line position of the character pattern. 3. EPROM data O4 to O0 correspond to character pattern data. 4. EPROM data O5 to O7 must be specified as 0. 5. A lit display position (black) corresponds to a 1. 6. Line 9 and the following lines must be blanked with 0s for a 5 × 8 dot character fonts. 15 Document Outline Description Features Ordering Information HD44780U Block Diagram HD44780U Pin Arrangement (FP-80B) HD44780U Pin Arrangement (TFP-80F) HD44780U Pad Arrangement HD44780U Pad Location Coordinates Pin Functions Function Description Interfacing to the MPU Reset Function Instructions Instruction Description Interfacing the HD44780U Power Supply for Liquid Crystal Display Drive Relationship between Oscillation Frequency and Liquid Crystal Display Frame Frequency Instruction and Display Correspondence Initializing by Instruction Absolute Maximum Ratings DC Characteristics AC Characteristics Bus Timing Characteristics Interface Timing Characteristics with External Driver Power Supply Conditions Using Internal Reset Circuit DC Characteristics AC Characteristics Bus Timing Characteristics Interface Timing Characteristics with External Driver Power Supply Conditions Using Internal Reset Circuit Electrical Characteristics Notes Load Circuits Timing Characteristics