參數(shù)資料
型號: μPD789407
廠商: NEC Corp.
英文描述: 8 Bit Single Chip Microcontrollers(8位單片微控制器)
中文描述: 8位單片機微控制器(8位單片微控制器)
文件頁數(shù): 79/128頁
文件大?。?/td> 607K
代理商: ΜPD789407
79
μ
PD789405, 789406, 789407
(3) LCD clock control register (LCDC)
The LCDC specifies the LCD clock and frame frequency.
The LCDC is manipulated using a 1-bit or 8-bit memory manipulation instruction.
A RESET clears the LCDC to 00H.
Figure 5-39. LCD Clock Control Register Format
LCDC3 LCDC2 LCDC1 LCDC0
LCDC
Symbol
Address
When reset
R/W
FFB2H
00H
R/W
7
6
5
4
3
2
1
0
LCD clock (f
LCD
) selection
Note
LCDC3
0
0
1
1
LCDC2
0
1
0
1
LCD frame frequency selection
LCDC1
0
0
1
1
LCDC0
0
1
0
1
0
0
0
0
f
LCD
/2
6
f
LCD
/2
7
f
LCD
/2
8
f
LCD
/2
9
f
X
/2
7
f
XT
Not to be set
Note
Specify an LCD clock (f
LCD
) frequency of at least 32 kHz.
Table 5-18 lists the frame frequencies used when f
XT
(32.768 kHz) is supplied to the LCD clock (f
LCD
).
Table 5-18. Frame Frequencies (Hz)
Frame frequency
Display duty ratio
f
XT
/2
(64 Hz)
9
f
XT
/2
(128 Hz)
8
f
XT
/2
(256 Hz)
7
f
XT
/2
(512 Hz)
6
Static
64
128
256
512
1/2
32
64
128
256
1/3
21
43
85
171
1/4
16
32
64
128
Remark
The parenthesized values apply when f
XT
(32.768 kHz) is supplied to the LCD clock (f
LCD
).
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