參數(shù)資料
型號: M34551E8-XXXFP
元件分類: 微控制器/微處理器
英文描述: 4-BIT, OTPROM, MICROCONTROLLER, PQFP48
封裝: 7 X 10 MM, 0.65 MM PITCH, PLASTIC, QFP-48
文件頁數(shù): 91/154頁
文件大?。?/td> 1778K
代理商: M34551E8-XXXFP
FUNCTIONAL BLOCK OPERATIONS
HARDWARE
1-30
4551 Group User’s Manual
(3) LCD RAM
RAM contains areas corresponding to the liquid crystal display.
When “1” is written to this LCD RAM, the display pixel
corresponding to the bit is automatically displayed.
(4) LCD drive waveform
When “1” is written to a bit in the LCD RAM data, the voltage
difference between common pin and segment pin which
correspond to the bit automatically becomes lVLC3l and the
display pixel at the cross section turns on.
When returning from reset, and in the RAM back-up mode, a
display pixel turns off because every segment output pin and
common output pin becomes VLC3 level (=VDD).
Fig. 26 LCD RAM map
Table 13 LCD control registers
Not used
LCD on/off bit
LCD duty and bias selection bits
LCD control register L1
L13
L12
L11
L10
at reset : 00002
at power down : state retained
0
1
0
1
R/W
This bit has no function, but read/write is enabled
Off
On
Not available
L11
0
1
L10
0
1
0
1
Duty
1/2
1/3
1/4
Bias
1/2
1/3
LCD control register L2
at reset : 11112
at power down : state retained
W
0
1
0
1
0
1
0
1
SEG19
P23
SEG18
P22
SEG17
P21
SEG16
P20
L23
L22
L21
L20
P23/SEG19 pin function switch bit
P22/SEG18 pin function switch bit
P21/SEG17 pin function switch bit
P20/SEG16 pin function switch bit
Note: “R” represents read enabled, and “W” represents write enabled.
Z
X
Y
Bit
8
9
10
11
12
13
14
15
COM
1
01
2
3
21
0
3
21
0
3
21
0
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
COM3
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
COM2
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
COM1
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
COM0
SEG9
SEG10
SEG11
SEG12
SEG13
SEG14
SEG15
COM3 COM2 COM1 COM0 COM3 COM2 COM1 COM0
SEG9
SEG10
SEG11
SEG12
SEG13
SEG14
SEG15
SEG9
SEG10
SEG11
SEG12
SEG13
SEG14
SEG15
SEG0 SEG0
SEG0
SEG0 SEG8
SEG17
SEG18
SEG19
SEG16
SEG8
SEG8 SEG8
SEG9
SEG10
SEG11
SEG12
SEG13
SEG14
SEG15
SEG17
SEG18
SEG19
SEG16
SEG17
SEG18
SEG19
SEG16
SEG17
SEG18
SEG19
SEG16
Note: The area marked “
” is not the LCD display RAM.
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