SN32F280 Series
32-Bit Cortex-M0 Micro-Controller
SONiX TECHNOLOGY CO., LTD
Page 193
Version 1.1
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4x40/6x38/7x37/8x36 LCD DRIVER
17.1 OVERVIEW
The MCU builds in R type structures with 4x40 or 6x38 or 7x37 or 8x36 dots. The LCD scan timing can support 1/4 duty,
1/6 duty, 1/7 duty, and 1/8 duty. Besides, 1/3 bias structure is also supported. Of these pins, all common and segment
pins are shared with GPIO, and can be selected by programming LCD_CTRL register.
R type is using internal or
external bias circuit to adjust LCD power and bias voltage.
The LCD driver supports a static mode controlled by LSTC control bit. If LSTC=0, the LCD driver is 1/3 bias, 1/4(or 1/6,
1/7, 1/8) duty LCD mode. If LSTC=1, the LCD driver is selected to static mode.
The LCD has two clock source and four clock rates to decide LCD frame rate from 15.625Hz to 256Hz. The clock source
is from internal 32KHz RC or external 32.768kHz oscillator crystal or RC type and controlled by LCDCKS bit.
In LCD mode, the LCD builds in one internal bias circuit to adjust LCD power and bias voltage. There are 40-pin GPIO
shared with COM pins and SEG pins which controlled by LCD_SEGSEL1 and LCD_SEGSEL2 registers and
LCDCOM[1:0] bits. After setup LCDEN bit, the LCD starts to output analog data. In static mode, the selected COM/SEG
pins switch to be GPIO output mode and only output 0V and VDD voltage.
After LCD operating, the system would be waked up from deep sleep mode to normal mode if the LCD interrupt is
enabled.
VLCD
Generator
1/3 Bias
Generator
LCD Timing
Control
LCD Data
Buffer
COMn Output
Control
SEGn Output
Control
Bias SW
PAD Control
COM0
Bias SW
PAD Control
COM1
Bias SW
PAD Control
COM2
Bias SW
PAD Control
COM3
Bias SW
PAD Control
SEG0
Bias SW
PAD Control
SEG1
Bias SW
PAD Control
SEG27
…
…
VLCD/V2/V1/GND
LCD Channel
Control Register
Bias SW
Bias SW
PAD Control
COM4/SEG28
Bias SW
Bias SW
PAD Control
COM7/SEG31
…
…
LCD COM mode
Control Register
…
…
…
…
Bias SW
PAD Control
SEG32
Bias SW
PAD Control
SEG33
Bias SW
PAD Control
SEG39
…
…
Содержание SN32F280 Series
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