ATMEGA329P-20MN Atmel, ATMEGA329P-20MN Datasheet - Page 237

• Manufacturer Part Number: ATMEGA329P-20MN
• Description: IC MCU AVR 32K 20MHZ 64QFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA329P-20MN

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: SPI, UART/USART, USI
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 54
• Program Memory Size: 32KB (16K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 1K x 8
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-MLF®, 64-QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

23.4
23.4.1
8021G–AVR–03/11
LCD Usage
LCD Initialization
The following section describes how to use the LCD.
Prior to enabling the LCD some initialization must be preformed. The initialization process nor-
mally consists of setting the frame rate, duty, bias and port mask. LCD contrast is set initially, but
can also be adjusted during operation.
Consider the following LCD as an example:
Figure 23-8.
Display:
Number of common terminals:
Number of segment terminals:
Bias system:
Drive system:
Operating voltage:
ATmega329
51
1b
1c
50
COM3
SEG0
SEG1
SEG2
49
2e
2f
48
47
46
45
LCD
2a
2g
2d
2b
2c
TN Positive, Reflective
3
1/3 Bias
1/3 Duty
3.0 ± 0.3 V
21
SEG2
SEG1
SEG0
ATmega329P/3290P
Connection table
COM0
1b,1c
2c
2f
COM1
2g
2d
2a
COM2
2e
2b
..
237