ATMEGA649V-8AUR Atmel, ATMEGA649V-8AUR Datasheet - Page 240
![IC AVR MCU FLASH 64K 1.8V 64TQFP](/photos/12/13/121332/313-64-tqfp_sml.jpg)
ATMEGA649V-8AUR
Manufacturer Part Number
ATMEGA649V-8AUR
Description
IC AVR MCU FLASH 64K 1.8V 64TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA329-16AU.pdf
(392 pages)
Specifications of ATMEGA649V-8AUR
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
53
Program Memory Size
64KB (32K x 16)
Program Memory Type
FLASH
Eeprom Size
2K x 8
Ram Size
4K 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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ATmega329/3290/649/6490
• Bit 7 – LCDCS: LCD Clock Select
When this bit is written to zero, the system clock is used. When this bit is written to one, the
external asynchronous clock source is used. The asynchronous clock source is either
Timer/Counter Oscillator or external clock, depending on EXCLK in ASSR. See
Operation of Timer/Counter2” on page 151
• Bit 6 – LCD2B: LCD 1/2 Bias Select
When this bit is written to zero, 1/3 bias is used. When this bit is written to one, ½ bias is used.
Refer to the LCD Manufacture for recommended bias selection.
• Bit 5:4 – LCDMUX1:0: LCD Mux Select
The LCDMUX1:0 bits determine the duty cycle. Common pins that are not used are ordinary port
pins. The different duty selections are shown in
Table 23-2.
Note:
• Bits 3:0 – LCDPM3:0: LCD Port Mask
The LCDPM3:0 bits determine the number of port pins to be used as segment drivers. The dif-
ferent selections are shown in
Table 23-3.
LCDPM3
LCDMUX1
0
0
0
0
0
0
0
0
1
1
1
1
1
0
0
1
1
1. 1/2 bias when LCD2B is written to one and 1/3 otherwise.
LCDPM2
LCD Duty Select
LCDMUX0
LCD Port Mask (Values in bold are only available in ATmega3290/6490)
0
0
0
0
1
1
1
1
0
0
0
0
1
0
1
0
1
LCDPM1
0
0
1
1
0
0
1
1
0
0
1
1
0
Static
Duty
Table
1/2
1/3
1/4
LCDPM0
23-3. Unused pins can be used as ordinary port pins.
0
1
0
1
0
1
0
1
0
1
0
1
0
1/2 or 1/3
1/2 or 1/3
1/2 or 1/3
for further details.
Static
Bias
I/O Port in Use as
Table
Segment Driver
(1)
(1)
(1)
SEG0:12
SEG0:14
SEG0:16
SEG0:18
SEG0:20
SEG0:22
SEG0:23
SEG0:24
SEG0:26
SEG0:28
SEG0:30
SEG0:32
SEG0:34
23-2.
COM Pin
COM0:1
COM0:2
COM0:3
COM0
Maximum Number
of Segments
I/O Port Pin
COM1:3
COM2:3
COM3
None
13
15
17
19
21
23
24
25
27
29
31
33
35
“Asynchronous
2552K–AVR–04/11
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