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ATmega169P 데이터시트(PDF) 249 Page - ATMEL Corporation

부품명 ATmega169P
상세설명  8-bit Microcontroller with 16K Bytes In-System Programmable Flash
PDF  393 Pages
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제조업체  ATMEL [ATMEL Corporation]
홈페이지  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega169P 데이터시트(HTML) 249 Page - ATMEL Corporation

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249
8018N–AVR–08/09
ATmega169P
23.5.4
LCDCCR – LCD Contrast Control Register
• Bits 7:5 – LCDDC2:0: LDC Display Configuration
The LCDDC2:0 bits determine the amount of time the LCD drivers are turned on for each volt-
age transition on segment and common pins. A short drive time will lead to lower power
consumption, but displays with high internal resistance may need longer drive time to achieve
satisfactory contrast. Note that the drive time will never be longer than one half prescaled LCD
clock period, even if the selected drive time is longer. When using static bias or blanking, drive
time will always be one half prescaled LCD clock period.
• Bit 4 – LCDMDT: LCD Maximum Drive Time
Writing this bit to one turns the LCD drivers on 100% on the time, regardless of the drive time
configured by LCDDC2:0.
• Bits 3:0 – LCDCC3:0: LCD Contrast Control
The LCDCC3:0 bits determine the maximum voltage V
LCD on segment and common pins. The
different selections are shown in Table 23-8. New values take effect every beginning of a new
frame.
Bit
765
4
321
0
(0xE7)
LCDDC2
LCDDC1
LCDDC0
LCDMDT
LCDCC3
LCDCC2
LCDCC1
LCDCC0
LCDCCR
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial Value
0
0
0
0
0
0
0
0
Table 23-7.
LCD Display Configuration
LCDDC2
LCDDC1
LCDDC0
Nominal drive time
0
0
0
300 µs
001
70 µs
0
1
0
150 µs
0
1
1
450 µs
1
0
0
575 µs
1
0
1
850 µs
1
1
0
1150 µs
111
50% of clkLCD_PS



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