ATMEGA329P-20MN Atmel, ATMEGA329P-20MN Datasheet - Page 243

• 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

23.5.3
8021G–AVR–03/11
LCDFRR – LCD Frame Rate Register
Table 23-3.
Note:
• Bit 7 – Reserved
This bit is reserved and will always read as zero.
• Bits 6:4 – LCDPS2:0: LCD Prescaler Select
The LCDPS2:0 bits selects tap point from a prescaler. The prescaled output can be further
divided by setting the clock divide bits (LCDCD2:0). The different selections are shown in
23-4. Together they determine the prescaled LCD clock (clk
module.
Table 23-4.
Bit
(0xE6)
Read/Write
Initial Value
LCDPM3
LCDPS2
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1. LCDPM3 is reserved and will always read as zero in ATmega329P.
LCDPM2
LCDPS1
LCD Port Mask (Values in bold are only available in ATmega3290P) (Continued)
LCD Prescaler Select
R
7
–
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
LCDPS2
R/W
LCDPM1
6
0
LCDPS0
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
LCDPS1
R/W
5
0
LCDPM0
Output from
Prescaler
clk
clk
clk
clk
clk
clk
0
1
0
1
0
1
0
1
0
1
0
1
LCDPS0
LCD
LCD
LCD
R/W
LCD
LCD
LCD
4
0
/128
/256
/512
/16
/64
/N
I/O Port in Use as
R
Segment Driver
3
–
0
Applied Prescaled LCD Clock Frequency
SEG0:36
SEG0:38
SEG0:39
SEG0:20
SEG0:22
SEG0:23
SEG0:24
SEG0:26
SEG0:28
SEG0:30
SEG0:32
SEG0:34
when LCDCD2:0 = 0, Duty = 1/4, and
ATmega329P/3290P
LCDCD2
LCD_PS
R/W
2
0
Frame Rate = 64 Hz
), which is clocking the LCD
LCDCD1
R/W
130kHz
260kHz
1
0
8.1kHz
33kHz
66kHz
Maximum Number
LCDCD0
of Segments
R/W
0
0
21
23
24
25
27
29
31
33
35
37
39
40
LCDFRR
Table
243