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参数资料
| 型号： | M0121LB-222LHAR2-I1 |
| 厂商： | Newhaven Display Intl |
| 文件页数： | 15/17页 |
| 文件大小： | 726K |
| 描述： | MODULE VF CHAR 1X21 14.5MM |
| 标准包装： | 50 |
| 外形L x W x H： | 195.00mm x 45.00mm x 25.00mm |
| 可视范围： | 144.00mm L x 18.00mm W |
| 显示器类型： | 字符 |
| 格式： | 5 x 7 点 |
| 电源电压： | 4.5 V ~ 5.5 V |
| 字符尺寸： | 14.50mm H x 4.10mm W |
| 工作温度： | -20°C ~ 70°C |
DOCUMENT NO.
REV .NO PAGE
STANDARD
NAME
SPECIFICATION FOR APPROVAL
00 6/16
5. FUNCTION DESCRIPTIONS
5.1 Registers in VFD Controller
The VFD controller has two 8-bit registers, an instruction register (IR) and a data register (DR).
IR stores instruction codes, such as display clear and address information for DD-RAM and CG-RAM.
The IR can only be written from the host MPU. DR temporarily stores data to be written into DD-RAM
or CG-RAM.
Data written into the DR from the MPU is automatically written into DD-RAM or CG-RAM by
an internal operation.
By the register selector (RS) signal, these two registers can be selected (See Table_8).
Table_8 Register Selection
RS /CS /WR Operation
0 0 0 to 1 IR write as an internal operation (display clear, etc.)
1 0 0 to 1 DR write as an internal operation (DR to DDRAM or CGRAM)
×: Don’t care
5.1.1 Address Counter (ACC)
The address counter (ACC) assigns addresses to both DD-RAM and CG-RAM. When an address
Of an instruction is written into the IR, the address information is sent from the IR to the ACC.
Selection of either DD-RAM or CG-RAM is also determined concurrently by the instruction.
After writing into DD-RAM or CG-RAM, the ACC is automatically incremented by 1
( decremented by 1).
5.1.2 Display Data RAM (DD-RAM)
Display data RAM (DD-RAM) stores display data represented in 8-bit character codes.
The area in DD-RAM that is not used for display can be used as general data RAM.
See Table_9 for the relationships between DD-RAM addresses and positions on the VFD.
Table_9 Relation between Digit Position and DD-RAM data
Digit G1 G2 G3 G21 G22
Upper Row code 00Hex 01Hex 02Hex 14Hex 15Hex
Lower Row code 40Hex 41Hex 42Hex 54Hex 55Hex
5.1.3 Character Generator ROM (CG-RAM)
The character generator ROM (CG-ROM) generates character patterns of 5×7 dots from 8-bit
Character codes (Table-10). It can generate 112 kinds of 5×7 dot character patterns and 64
kinds of level bar patterns.
The character fonts are shown on the following page. The character coders 00Hex to 0Fhex
are allocated to the CG-RAM.
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