ATMEGA649V_14 Datasheet, PDF (236/392 Pages) ATMEL Corporation – High Endurance Non-volatile Memory Segments

Assembly Code Example⁽¹⁾
LCD_Init:
; Use 32 kHz crystal oscillator
; 1/3 Bias and 1/3 duty, SEG21:SEG24 is used as port pins
ldi r16, (1<<LCDCS) | (1<<LCDMUX1)| (1<<LCDPM2)
sts LCDCRB, r16
; Using 16 as prescaler selection and 7 as LCD Clock Divide
; gives a frame rate of 49 Hz
ldi r16, (1<<LCDCD2) | (1<<LCDCD1)
sts LCDFRR, r16
; Set segment drive time to 125 µs and output voltage to 3.3 V
ldi r16, (1<<LCDDC1) | (1<<LCDCC3) | (1<<LCDCC2) | (1<<LCDCC1)
sts LCDCCR, r16
; Enable LCD, default waveform and no interrupt enabled
ldi r16, (1<<LCDEN)
sts LCDCRA, r16
ret
C Code Example⁽¹⁾
Void LCD_Init(void);
{
/* Use 32 kHz crystal oscillator */
/* 1/3 Bias and 1/3 duty, SEG21:SEG24 is used as port pins */
LCDCRB = (1<<LCDCS) | (1<<LCDMUX1)| (1<<LCDPM2);
/* Using 16 as prescaler selection and 7 as LCD Clock Divide */
/* gives a frame rate of 49 Hz */
LCDFRR = (1<<LCDCD2) | (1<<LCDCD1);
/* Set segment drive time to 125 µs and output voltage to 3.3 V*/
LCDCCR = (1<<LCDDC1) | (1<<LCDCC3) | (1<<LCDCC2) | (1<<LCDCC1);
/* Enable LCD, default waveform and no interrupt enabled */
LCDCRA = (1<<LCDEN);
}
Note: 1. See “About Code Examples” on page 9.
Before a re-initialization is done, the LCD controller/driver should be disabled
236 ATmega329/3290/649/6490
2552K–AVR–04/11