ATmega128A Atmel Corporation, ATmega128A Datasheet - Page 199

• Manufacturer Part Number: ATmega128A
• Manufacturer: Atmel Corporation

Specifications of ATmega128A

• Flash (kbytes): 128 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: 53
• Ext Interrupts: 8
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Uart: 2
• 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): 4096
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 4
• Output Compare Channels: 8
• Input Capture Channels: 2
• Pwm Channels: 7
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

Table 20-10. Examples of UBRR Settings for Commonly Used Oscillator Frequencies
1.
Table 20-11. Examples of UBRR Settings for Commonly Used Oscillator Frequencies
8151H–AVR–02/11
Baud
Rate
(bps)
2400
4800
9600
14.4k
19.2k
28.8k
38.4k
57.6k
76.8k
115.2k
230.4k
250k
0.5M
1M
Max
Baud
Rate
(bps)
2400
4800
9600
14.4k
19.2k
28.8k
38.4k
57.6k
76.8k
115.2k
230.4k
250k
(1)
UBRR = 0, Error = 0.0%
UBRR
UBRR
207
103
95
47
23
15
11
51
34
25
16
12
7
5
3
2
1
0
0
–
–
8
6
3
1
1
230.4Kbps
U2X = 0
U2X = 0
f
f
osc
-7.8%
osc
-0.8%
-3.5%
-7.0%
Error
Error
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.2%
0.2%
0.2%
0.2%
2.1%
0.2%
8.5%
8.5%
0.0%
–
–
= 3.6864MHz
= 8.0000MHz
UBRR
UBRR
191
416
207
103
95
47
31
23
15
11
68
51
34
25
16
12
7
5
3
1
1
0
–
8
3
3
460.8Kbps
U2X = 1
U2X = 1
-7.8%
-7.8%
-0.1%
-0.8%
-3.5%
Error
Error
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.2%
0.2%
0.6%
0.2%
0.2%
2.1%
0.2%
8.5%
0.0%
–
UBRR
UBRR
103
287
143
51
25
16
12
71
47
35
23
17
11
8
6
3
2
1
0
–
–
8
5
2
2
0
250Kbps
U2X = 0
U2X = 0
f
osc
f
-3.5%
-7.0%
-7.8%
osc
Error
Error
0.2%
0.2%
0.2%
2.1%
0.2%
8.5%
8.5%
8.5%
8.5%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
–
–
=
= 4.0000MHz
11.0592
UBRR
UBRR
207
103
575
287
143
51
34
25
16
12
95
71
47
35
23
17
11
8
6
3
1
1
0
–
5
5
MHz
0.5Mbps
U2X = 1
U2X = 1
-0.8%
-3.5%
-7.0%
-7.8%
Error
Error
0.2%
0.2%
0.2%
0.2%
2.1%
0.2%
8.5%
8.5%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
–
UBRR
UBRR
191
383
191
95
47
31
23
15
11
95
63
47
31
23
15
11
7
5
3
1
1
0
–
7
3
3
460.8Kbps
U2X = 0
U2X = 0
f
f
osc
-7.8%
-7.8%
-7.8%
osc
Error
Error
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
ATmega128A
–
= 14.7456MHz
= 7.3728MHz
UBRR
UBRR
191
383
191
127
383
767
95
63
47
31
23
15
11
95
63
47
31
23
15
7
3
3
1
0
7
6
921.6Kbps
U2X = 1
U2X = 1
-7.8%
-7.8%
-7.8%
Error
Error
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
5.3%
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