ATmega649A Atmel Corporation, ATmega649A Datasheet - Page 249

• Manufacturer Part Number: ATmega649A
• Manufacturer: Atmel Corporation

Specifications of ATmega649A

• Flash (kbytes): 64 Kbytes
• Pin Count: 64
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 54
• Ext Interrupts: 17
• Usb Speed: No
• Usb Interface: No
• Spi: 2
• Twi (i2c): 1
• Uart: 1
• Segment Lcd: 100
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 4
• Eeprom (bytes): 2048
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8 to 5.5
• Operating Voltage (vcc): 1.8 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 3
• Output Compare Channels: 4
• Input Capture Channels: 1
• Pwm Channels: 4
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

24.5.2
8284D–AVR–6/11
LCDCRB – LCD Control and Status Register B
ATmega169A/PA/329A/PA/3290A/PA/649A/P/6490A/P
• Bit 0 – LCDBL: LCD Blanking
When this bit is written to one, the display will be blanked after completion of a frame. All seg-
ment and common pins will be driven to ground.
Note:
• 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 158
• 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 – LCDMUX[1:0]: LCD Mux Select
The LCDMUX[1:0] bits determine the duty cycle. Common pins that are not used are ordinary
port pins. The different duty selections are shown in
Table 24-2.
Note:
• Bits 3:0 – LCDPM[3:0]: 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
port pins.
Table 24-3.
Bit
(0xE5)
Read/Write
Initial Value
LCDPM3
LCDMUX1
0
0
0
0
0
1
1
Bit 3, LCDPM3 is only available in ATmega3290A/3290PA/6490A/6490P.
1. 1/2 bias when LCD2B is written to one and 1/3 otherwise.
LCDCS
R/W
LCDPM2
LCD Duty Select
LCD Port Mask (Values in bold are only available in
ATmega3290A/3290PA/6490A/6490P)
7
0
LCDMUX0
0
0
0
0
1
0
1
LCD2B
R/W
6
0
LCDPM1
0
0
1
LCDMUX1
Table 24-3 on page
R/W
5
0
Static
Duty
1/2
1/3
1/4
LCDPM0
LCDMUX0
0
1
0
R/W
for further details.
4
0
1/2 or 1/3
1/2 or 1/3
1/2 or 1/3
Static
Bias
LCDPM3
249. Unused pins can be used as ordinary
R/W
Table 24-2 on page
I/O Port in Use as
Segment Driver
3
0
(1)
(1)
(1)
SEG0:12
SEG0:14
SEG0:16
LCDPM2
COM Pin
R/W
COM0:1
COM0:2
COM0:3
COM0
2
0
LCDPM1
R/W
1
0
249.
Maximum Number
of Segments
LCDPM0
I/O Port Pin
R/W
”Asynchronous
COM1:3
COM2:3
0
0
COM3
None
13
15
17
LCDCRB
249