SED1520 Series
Read Display Data
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| R/W |
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A0 |
| RD |
| WR | D7 | D6 | D5 | D4 | D3 | D2 | D1 | D0 | ||
1 | 0 |
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| Read data | ||||||
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Reads
After loading a new address into the column address register one dummy read is required before valid data is obtained.
Select ADC
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A0 |
| RD |
| WR | D7 | D6 | D5 | D4 | D3 | D2 | D1 | D0 |
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0 | 1 |
| 0 |
| 1 | 0 | 1 | 0 | 0 | 0 | 0 | D | A0H, A1H | ||
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This command selects the relationship between display data RAM column addresses and segment drivers. D=1: SEG0 ← column address 4FH, … (inverted)
D=0: SEG0 ← column address 00H, … (normal)
This command is provided to reduce restrictions on the placement of driver ICs and routing of traces during printed circuit board design. See Figure 2 for a table of segments and column addresses for the two values of D.
Static Drive ON/OFF |
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| R/W |
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| A0 |
| RD |
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| WR | D7 | D6 | D5 |
| D4 | D3 | D2 | D1 | D0 |
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| 0 | 1 |
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| 1 | 0 | 1 |
| 0 | 0 | 1 | 0 | D | A4H, A5H | ||||
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Forces display on and all common outputs to be selected. |
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D=1: Static drive on |
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D=0: Static drive off |
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Select Duty |
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| R/W |
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| A0 |
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| RD |
| WR | D7 | D6 | D5 |
| D4 | D3 | D2 | D1 | D0 |
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| 0 | 1 |
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| 0 |
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| 1 | 0 | 1 |
| 0 | 1 | 0 | 0 | D | A8H, A9H | ||||
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This command sets the duty cycle of the LCD drive and is only valid for the SED1520F and SED1522F. It is invalid for the SED1521F which performs passive operation. The duty cycle of the SED1521F is determined by the externally generated FR signal.
| SED1520 | SED1522 |
D=1: | 1/32 duty cycle | 1/16 duty cycle |
D=0: | 1/16 duty cycle | 1/8 duty cycle |
When using the SED1520F0A, SED1522F0A (having a
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| SED1521F0A |
SED1520F0A | 1/32 | 1/32 |
| 1/16 | 1/16 |
SED1522F0A | 1/16 | 1/32 |
| 1/8 | 1/16 |
SED1520 | Series |
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EPSON |