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參數資料
| 型號： | S1D13700F02A100 |
| 元件分類： | 顯示控制器 |
| 英文描述： | 320 X 240 PIXELS CRT OR FLAT PNL GRPH DSPL CTLR, PQFP64 |
| 封裝： | LEAD FREE, TQFP-64 |
| 文件頁數： | 75/108頁 |
| 文件大?。?/td> | 1373K |
| 代理商： | S1D13700F02A100 |
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4: FUNCTION DESCRIPTION
64
EPSON
S1D13700 Technical Manual
4.1.6
Determining Various Parameters
(1) Determining FX
Determine the character eld size in the X direction [FX] from the number of dots in the X direction of
display [VD] and the number of characters in the X direction [VC].
[VD] / [VC]
≤ [FX]
The brackets [ ] denote an integral value beginning with 1, and [FX] indicates the number of dots.
(2) Determining C/R
Next, determine a value for [C/R] from the values of [VC] and [FX].
[C/R] = | [FX] / 8 | rounded up x [VC]
Note: [C/R] indicates the number of characters obtained in units of addresses.
(3) Determining TC/R
TC/R must maintain the relationship [TC/R]
≥ [C/R] + 4.
(4) Relationship between fOSC and fFR
Once TC/R has been determined, the lower-limit value of the oscillation frequency (fOSC) can be obtained
from the equation below because the frame frequency (fFR) and number of display lines [L/F] are
predetermined.
fOSC ≥ {[TC/R] x 9 + 1} x [L/F] x fFR
Note: 1. If standard crystals close to fOSC thus obtained are unavailable, determine the appropri-
ate fOSC value for crystals with higher oscillation frequencies than the obtained value. To
do so, reverse the calculation of the [TC/R] value in the equation above.
2. For the fFR value of Epson LCD units, refer to the LCD unit specifications.
(5) Symptoms observed when TC/R is set incorrectly
Scanning of display in the Y direction stops, with horizontal lines displayed in high contrast.
All pixels go on or go off.
The LP pin output signal is incomplete or inactive.
The display of graphics or text becomes unstable.
Should any of the symptoms above be observed, even though the S1D13700’s other signals connected to
the LCD unit are normal, check whether the TC/R value is correct. If the TC/R value is the cause of the
problem, simply set a larger TC/R value to restore normal operation.
Note: 1. Because the number of display dots varies with each LCD unit, there will be some frac-
tional display dots depending on the value set for FX. In such case, the S1D13700 auto-
matically blanks fractional parts at the right edge of the panel, and thus eliminates the
need to manipulate display memory for adjustment.
2. Calculations are made assuming fFR = 60 Hz.
Table 4-2 Example of Parameters for the LCD Unit
Number of pixels
(X x Y)
[FX]
[FY]
[C/R]
TC/R
X'tal
(MHz)
320 x 240
e.g., [FX] = 8 dots
320
÷ 8 = 40...0
No blank dots
From a practical
point of view, 8, 16,
etc. are suitable.
[CR] = 40 = address
→ 27H
During HDOT SCR, [C/R] = 41 addresses
2BH
5.72
e.g., [FX] = 6 dots
320
÷ 6 = 53...2
Two blank dots
↑
[CR] = 53 = address
→ 34H
During HDOT SCR, [C/R] = 54 addresses
38H
7.40
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