参数资料
型号: SM5L3
厂商: SHARP ELECTRONICS CORP
元件分类: 微控制器/微处理器
英文描述: 4-BIT, MROM, MICROCONTROLLER, PQFP80
封装: 14 X 20 MM, PLASTIC, QFP-80
文件页数: 15/27页
文件大小: 164K
代理商: SM5L3
SM5L1/SM5L2/SM5L3
4-Bit Single Chip Microcomputers
22
Microcomputer Data Sheet
LCD Function
DISPLAY SEGMENT
The SM5Lx contains a built-in circuit which directly
drive a 1/4 duty, 1/2 bias LCD. A sample LCD pattern
is shown in Figure 27.
A segment of the LCD can be turned on or off by set-
ting the corresponding bit in the display RAM (see Fig-
ure 14) to ‘1’ or ‘0’. The displayed segments can
assume any configuration containing up to a maximum
of 84/136/168 segments. An example of seven seg-
ment numeric display is shown in Figure 28.
LCD DRIVE WAVEFORMS
The LCD drive waveforms for the LCD pattern of
Figure 28 displaying a ‘5’ are shown in Figure 29 (the
segment output uses S0 and S1). For Figure 29, 3 V is
applied to the VDD pin, a 1.5 V is applied to the VM pin.
Figure 27. LCD Pattern
Figure 28. Sample LCD Pattern for
Seven Segment Numeric Display
H0
H1
H2
S2
S1
S0
H3
S20
SM5L1
SM5L2
SM5L3
S19 S18
S17
S16
S15
S33
S32 S31
S30
S29
S28
S41
S40 S39
S38
S37
S36
. . .
5L1-27
H1
S0
S2
5L1-28
H0
H2
H3
Figure 29. LCD Drive Waveforms
H0
VDD (3 V)
VM (1.5 V)
GND (0 V)
VDD (3 V)
VM (1.5 V)
GND (0 V)
VDD (3 V)
VM (1.5 V)
GND (0 V)
VDD (3 V)
VM (1.5 V)
GND (0 V)
VDD (3 V)
VM (1.5 V)
GND (0 V)
H1
H2
H3
S0
S1
T
5L1-29
NOTE: Frame Frequency = 1/T = 64 Hz or 128 Hz
Frame frequency is selectable by mask option.
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