2X20 LCD Compatible VFD Module
20T202DA1E (Rev. 3.0)
~~~~~~~~~~~~~~~~ Index ~~~~~~~~~~~~~~~~
1. SCOPE...................................................................................................................................................................Page - 3
2. FEATURES...........................................................................................................................................................Page - 3
3. PRECAUTIONS.....................................................................................................................................................Page - 3
4. PRODUCT SPECIFICATIONS....................................................................................................................... Page - 4
4.1 Type..................................................................................................................................................................Page - 4
4.2 Outer Dimensions, Weight............................................................................................................................. Page - 4
4.3 Environment Conditions.................................................................................................................................Page - 4
4.4 Absolute Maximum Ratings...........................................................................................................................Page - 4
4.5 Recommended Operating Conditions.............................................................................................................Page - 4
4.6 DC Characteristics.............................................................................................................................................Page - 4
4.7 Timing Chart and AC Characteristics..............................................................................................................Page - 5
4.7.1 Power-on Reset and/or RESET Signal Timing......................................................................................Page - 5
4.7.4 M68 Type CPU Bus Write-in Timing.................................................................................................... Page - 5
4.7.5 M68 Type CPU Bus Read-out Timing...................................................................................................Page - 5
4.7.2 i80 Type CPU Bus Write-in Timing.......................................................................................................Page - 6
4.7.3 i80 Type CPU Bus Read-out Timing......................................................................................................Page - 6
4.8 Connector Pin Assignment................................................................................................................................Page - 6
4.9 System Block Diagram......................................................................................................................................Page - 7
4.10 Connector through Hole Location..................................................................................................................Page - 7
4.11 Outer Dimensions............................................................................................................................................Page - 8
4.12 Pattern Details..................................................................................................................................................Page - 8
5. FUNCTION DESCRIPTIONS..........................................................................................................................Page - 9
5.1 Registers in VFD Controller.......................................................................................................................... Page - 9
5.1.1 Busy Flag (BF).......................................................................................................................................Page - 9
5.1.2 Address Counter (ACC)....................................................................................................................... Page - 9
5.1.3 Display Data RAM (DD-RAM)...........................................................................................................Page - 9
5.1.4 Character Generator ROM (CG-ROM)...............................................................................................Page - 9
5.1.5 Character Generator RAM (CG-RAM)...............................................................................................Page - 9
* CG-RAM Font Design Example............................................................................................................... Page - 10
5.2 Interfacing to the MPU................................................................................................................................... Page - 11
5.3 MPU Type Select Function...............................................................................................................................Page - 11
5.4 Reset Function....................................................................................................................................................Page - 11
5.4.1 Power-on Reset.........................................................................................................................................Page - 11
5.4.2 External Reset........................................................................................................................................Page - 11
6. INSTRUCTIONS................................................................................................................................................... Page - 12
6.1 Outline................................................................................................................................................................ Page - 12
6.2 Instructions Descriptions.................................................................................................................................. Page - 13
6.2.1 Display Clear............................................................................................................................................ Page - 13
6.2.2 Cursor Home............................................................................................................................................ Page - 13
6.2.3 Entry Mode Set...................................................................................................................................... Page - 13
6.2.4 Display ON/OFF................................................................................................................................... Page - 14
6.2.5 Cursor/Display Shift................................................................................................................................ Page - 15
6.2.6 Function Set..............................................................................................................................................Page - 15
6.2.7 Set CG-RAM Address............................................................................................................................. Page - 15
6.2.8 Set DD-RAM Address...........................................................................................................................Page - 15
6.2.9 Read Busy Flag and Address...................................................................................................................Page - 15
6.2.10 Write Data to CG or DD-RAM.......................................................................................................... Page - 15
6.2.11 Read Data from CG or DD-RAM....................................................................................................Page - 16
6.3 Example of Initialization after Power ON.......................................................................................................Page - 16
* Character Code Table (CG-RAM & CG-ROM)............................................................................................Page - 17
Page - 2 of 17
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