參數(shù)資料
型號(hào)： HD40L4818
廠商： Hitachi,Ltd.
英文描述： 4-Bit Single-Chip Microcomputer(4位單片微計(jì)算機(jī))
中文描述： 4位單片機(jī)（4位單片微計(jì)算機(jī)）
文件頁數(shù)： 62/98頁
文件大?。?/td> 621K
代理商： HD40L4818
HD404818 Series
62
LCD Controller/Driver
The MCU contains four common signal pins, the controller, and the driver. The controller and the driver
drive 32 segment signal pins. The controller consists of display data RAM, the LCD control register (LCR),
and the LCD duty-cycle/clock control register (LMR) (figure 34). Four programmable duty cycles and
LCD clocks are available. Since the MCU contains a dual port RAM, display data can be transferred to
segment signal pins automatically without program control. When selecting the 32-kHz oscillation clock as
the LCD clock source, the system allows the LCD to display even in watch mode, in which the system
clock halts.
V
CC
Power switch
V
1
V
2
V
3
GND
LCD
common
driver
Display on/off
LCD duty-
cycle/clock
control register
Display
control
register
LCD
segment
driver
LCD
clock
$050
$06F
RAM area
Duty selection
Clock selection
2
2
3
LCD
clock
SEG32
SEG2
SEG1
COM4
COM3
COM2
COM1
System clock dividing
output (CL1–CL3)
32-kHz clock dividing
output (CL0)
2
Display
area
(dual port
RAM)
LMR: $014
LCR: $013
1
LCD
power
supply
control
circuit
Figure 34 LCD Controller/Driver Configuration
LCD Data Area and Segment Data ($050 to $06F):
Figure 35 shows the configuration of the LCD RAM
area. Each bit of this area, corresponding to four types of duty cycles, can be transmitted to the segment
driver as display data by programming the area corresponding to the duty cycle.
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