ATmega3290P datasheet(235/385 Pages) ATMEL

235 / 385 page

235

8021E–AVR–07/09

ATmega329P/3290P

Note:

1. See Section “5.” on page 9.

Before a re-initialization is done, the LCD controller/driver should be disabled

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);

}

ATmega3290P Datasheet(PDF) 235 Page - ATMEL Corporation

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