ATmega88PA Atmel Corporation, ATmega88PA Datasheet - Page 197

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ATmega88PA

Manufacturer Part Number
ATmega88PA
Description
Manufacturer
Atmel Corporation
Datasheets

Specifications of ATmega88PA

Flash (kbytes)
8 Kbytes
Pin Count
32
Max. Operating Frequency
20 MHz
Cpu
8-bit AVR
# Of Touch Channels
12
Hardware Qtouch Acquisition
No
Max I/o Pins
23
Ext Interrupts
24
Usb Speed
No
Usb Interface
No
Spi
2
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
Yes
Crypto Engine
No
Sram (kbytes)
1
Eeprom (bytes)
512
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
Yes
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
6
Input Capture Channels
1
Pwm Channels
6
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes

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Examples of UBRRn Settings for Commonly Used Oscillator Frequencies
Note:
8271D–AVR–05/11
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)
1. UBRRn = 0, Error = 0.0%
UBRRn
25
12
6
3
2
1
1
0
U2Xn = 0
62.5kbps
f
Error
-18.6%
-7.0%
osc
0.2%
0.2%
8.5%
8.5%
8.5%
8.5%
= 1.0000MHz
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
Range” on page
UBRRn
51
25
12
8
6
3
2
1
1
0
U2Xn = 1
125kbps
Error
-18.6%
-3.5%
-7.0%
0.2%
0.2%
0.2%
8.5%
8.5%
8.5%
8.5%
194). The error values are calculated using the following equation:
ATmega48A/PA/88A/PA/168A/PA/328/P
UBRRn
47
23
11
7
5
3
2
1
1
0
115.2kbps
U2Xn = 0
Error[%]
f
osc
Error
-25.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
= 1.8432MHz
=
BaudRate
------------------------------------------------- - 1
UBRRn
BaudRate
95
47
23
15
11
230.4kbps
2
U2Xn = 1
7
5
3
1
0
Closest Match
Error
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
UBRRn
51
25
12
100%
8
6
3
2
1
1
0
U2Xn = 0
125kbps
”Asynchronous Operational
f
Error
osc
-18.6%
-3.5%
-7.0%
0.2%
0.2%
0.2%
8.5%
8.5%
8.5%
8.5%
= 2.0000MHz
UBRRn
103
51
25
16
12
8
6
3
2
1
0
U2Xn = 1
250kbps
Error
-3.5%
-7.0%
0.2%
0.2%
0.2%
2.1%
0.2%
8.5%
8.5%
8.5%
0.0%
197

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