参数资料
型号: M34551E8FP
元件分类: 微控制器/微处理器
英文描述: 4-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PQFP48
封装: 7 X 10 MM, 0.65 MM PITCH, PLASTIC, QFP-48
文件页数: 15/155页
文件大小: 1329K
代理商: M34551E8FP
APPLICATION
2.5 LCD function
2-33
4551 Group User’s Manual
Duty
1/2
1/3
1/4
Bias
1/2
1/3
Maximum number
of displayed pixels
40 segments
60 segments
80 segments
Used COM pins
COM0, COM1 (Note)
COM0–COM2 (Note)
COM0–COM3 (Note)
Table 2.5.1 Duty and maximum number of displayed pixels
2.5 LCD function
The 4551 Group has an LCD (Liquid Crystal Display) controller/driver.
4 common signal output pins and 20 segment signal output pins can be used to drive the LCD. By using
these pins, up to 80 segments (when 1/4 duty and 1/3 bias are selected) can be controlled to display.
This section describes the LCD operation description, related registers, application examples using the LCD
and notes.
2.5.1 Operation description
(1)
LCD duty and bias control
Table 2.5.1 shows the duty and maximum number of displayed pixels. Use bits 0 and 1 of LCD
control register (L1) to select the proper display method for the LCD panel being used. Also, when
using segment pins are 19 or less, SEG16–SEG19 can be used as an I/O port with register L2.
Note: Leave unused COM pins open.
(2)
LCD drive timing
The frequency (F) of the LCD clock generating the LCD drive timing and frame frequency are shown
below. Figure 2.5.1 shows the structure of the LCD clock circuit.
q When the prescaler output (ORCLK) is used for the timer 2 count source (W23 = “1”)
F = ORCLK !!
!
q When f(XCIN) is used for the timer 2 count source (W23 = “0”)
F = f(XCIN)
!
The frame frequency for each display method can be obtained by the following formula.
Frame frequency =
(Hz)
Frame period =
(s)
[F: Frame frequency, 1/n: Duty]
1
16
1
LC + 1
1
2
1
16
1
LC + 1
1
2
F
n
F
Fig. 2.5.1 LCD clock control circuit structure
1/2
1/16
W30
0
1
(Note 1)
XCIN
W23
0
1
ORCLK
STCK
W31
1
0
(Note 2)
Timer 2
Timer LC
LCD clock
Notes 1: Count source is stopped by clearing W30 to “0.”
2: When the LCD function is used, set W31 to “0.”
!
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