ATMEGA169PV-8MCHR Atmel, ATMEGA169PV-8MCHR Datasheet - Page 243
ATMEGA169PV-8MCHR
Manufacturer Part Number
ATMEGA169PV-8MCHR
Description
MCU AVR 16KB FLASH 16MHZ 64QFN
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA169PV-8AU.pdf
(395 pages)
Specifications of ATMEGA169PV-8MCHR
Core Processor
AVR
Core Size
8-Bit
Speed
8MHz
Connectivity
SPI, UART/USART, USI
Peripherals
Brown-out Detect/Reset, LCD, POR, PWM, WDT
Number Of I /o
54
Program Memory Size
16KB (8K x 16)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
*
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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23.4.2
8018P–AVR–08/10
Updating the LCD
Note:
Before a re-initialization is done, the LCD controller/driver should be disabled.
Display memory (LCDDR0, LCDDR1, ..), LCD Blanking (LCDBL), Low power waveform
(LCDAB) and contrast control (LCDCCR) are latched prior to every new frame. There are no
restrictions on writing these LCD Register locations, but an LCD data update may be split
between two frames if data are latched while an update is in progress. To avoid this, an interrupt
routine can be used to update Display memory, LCD Blanking, Low power waveform, and con-
trast control, just after data are latched.
Assembly Code Example
C Code Example
LCD_Init:
Void LCD_Init(void);
{
}
; Use 32 kHz crystal oscillator
; 1/3 Bias and 1/3 duty, SEG21:SEG24 is used as port pins
ldi
sts
; Using 16 as prescaler selection and 7 as LCD Clock Divide
; gives a frame rate of 49 Hz
ldi
sts
; Set segment drive time to 125 µs and output voltage to 3.3 V
ldi
sts
; Enable LCD, default waveform and no interrupt enabled
ldi
sts
ret
/* 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);
1.
See ”About Code Examples” on page 10.
r16, (1<<LCDCS) | (1<<LCDMUX1)| (1<<LCDPM2)
LCDCRB, r16
r16, (1<<LCDCD2) | (1<<LCDCD1)
LCDFRR, r16
r16, (1<<LCDDC1) | (1<<LCDCC3) | (1<<LCDCC2) | (1<<LCDCC1)
LCDCCR, r16
r16, (1<<LCDEN)
LCDCRA, r16
(1)
(1)
ATmega169P
243
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