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參數(shù)資料
| 型號： | S1C621C0D |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, MROM, 1.3 MHz, MICROCONTROLLER, UUC74 |
| 封裝： | DIE-74 |
| 文件頁數(shù)： | 48/108頁 |
| 文件大小： | 992K |
| 代理商： | S1C621C0D |
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36
EPSON
S1C621C0 TECHNICAL MANUAL
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (LCD Driver)
LDTY1, LDTY0: LCD drive duty selection (C0HD1, D0)
Sets the LCD drive duty as shown in Table 4.7.7.2.
Table 4.7.7.2 LCD drive duty setting
LDTY1
0
1
LDTY0
0
1
X
Duty
1/2
1/3
1/4
COM0, COM1
COM0–COM2
COM0–COM3
Frame frequency *
fOSC1/1,024 (32 Hz)
fOSC1/768 (42.7 Hz)
fOSC1/1,024 (32 Hz)
68 (34
× 2)
102 (34
× 3)
136 (34
× 4)
Terminals used
in common
Maximum number
of segments
* In case of fOSC1 = 32.768 kHz
At initial reset, these registers are set to "0".
LDMS: LCD display memory area selection (C0HD3)
Selects the display memory area.
When "1" is written:
Page 0 (R/W)
When "0" is written:
Page 4 (W)
Reading:
Valid
By writing "1" to LDMS, page 0 is selected and addresses 050H–07FH become the display memory. Since a
RAM has been allocated in this area, it can be used as the display memory for reading/writing.
When LDMS is set to "0", page 4 (450H–47FH) becomes the display memory. This area is write only.
At initial reset, this register is set to "0".
Display memory (50H–7FH)
The LCD segments are lit or turned off depending on this data.
When "1" is written:
Lit
When "0" is written:
Not lit
Reading:
Invalid
By writing data into the display memory allocated to the LCD segment (on the panel), the segment can be
lit or put out.
At initial reset, the contents of the display memory are undefined.
4.7.8 Programming notes
(1) The contents of the display memory are undefined until the area is initialized (through, for instance,
memory clear processing by the CPU). Initialize the display memory by executing initial processing.
(2) When page 4 is selected for the display memory area, since the display memory area is write-only,
display data cannot be rewritten by arithmetic operations (such as AND, OR, ADD, SUB).
(3) 100 msec or more time is necessary for stabilizing the LCD drive voltages VC1, VC2 and VC3 after setting
the LCD power control register LPWR to "1". Be careful of the segment-on right after the power is
turned on.
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