ATmega6490 Atmel Corporation, ATmega6490 Datasheet - Page 240
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ATmega6490
Manufacturer Part Number
ATmega6490
Description
Manufacturer
Atmel Corporation
Specifications of ATmega6490
Flash (kbytes)
64 Kbytes
Pin Count
100
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
69
Ext Interrupts
32
Usb Speed
No
Usb Interface
No
Spi
2
Twi (i2c)
1
Uart
1
Segment Lcd
160
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
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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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