ATmega8535 Atmel Corporation, ATmega8535 Datasheet - Page 170

• Manufacturer Part Number: ATmega8535
• Manufacturer: Atmel Corporation

Specifications of ATmega8535

• Flash (kbytes): 8 Kbytes
• Pin Count: 44
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 32
• Ext Interrupts: 3
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Uart: 1
• 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): 0.5
• Eeprom (bytes): 512
• 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: 3
• Output Compare Channels: 4
• Input Capture Channels: 1
• Pwm Channels: 4
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

Examples of Baud Rate
Setting
Table 69. Examples of UBRR Settings for Commonly Used Oscillator Frequencies
1.
170
Baud
Rate
(bps)
2400
4800
9600
14.4k
19.2k
28.8k
38.4k
57.6k
76.8k
115.2k
230.4k
250k
Max
(1)
UBRR = 0, Error = 0.0%
ATmega8535(L)
UBRR
25
12
6
3
2
1
1
0
–
–
–
–
62.5 kbps
U2X = 0
f
Error
-18.6%
osc
-7.0%
8.5%
8.5%
0.2%
0.2%
8.5%
8.5%
–
–
–
–
= 1.0000 MHz
UBRR
51
25
12
8
6
3
2
1
1
0
–
–
125 kbps
U2X = 1
For standard crystal and resonator frequencies, the most commonly used baud rates for
asynchronous operation can be generated by using the UBRR settings in Table 69.
UBRR values which yield an actual baud rate differing less than 0.5% from the target
baud rate, are bold in the table. Higher error ratings are acceptable, but the Receiver will
have less noise resistance when the error ratings are high, especially for large serial
frames (see “Asynchronous Operational Range” on page 160). The error values are cal-
culated using the following equation:
Error
-18.6%
-3.5%
-7.0%
0.2%
0.2%
0.2%
8.5%
8.5%
8.5%
8.5%
–
–
UBRR
47
23
11
7
5
3
2
1
1
0
–
–
115.2 kbps
U2X = 0
Error[%]
f
Error
-25.0%
osc
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
–
–
= 1.8432 MHz
=
UBRR
⎛
⎝
BaudRate
------------------------------------------------------- - 1
95
47
23
15
11
7
5
3
2
1
0
–
230.4 kbps
U2X = 1
BaudRate
Error
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
Closest Match
–
UBRR
51
25
12
–
8
6
3
2
1
1
0
–
–
125 kbps
U2X = 0
⎞
⎠
•
100%
f
Error
-18.6%
osc
-3.5%
-7.0%
0.2%
0.2%
0.2%
8.5%
8.5%
8.5%
8.5%
–
–
= 2.0000 MHz
UBRR
103
16
12
51
25
8
6
3
2
1
–
0
250 kbps
2502K–AVR–10/06
U2X = 1
Error
-3.5%
-7.0%
2.1%
0.2%
8.5%
8.5%
8.5%
0.2%
0.2%
0.2%
0.0%
–