ATMEGA168-15AZ Atmel, ATMEGA168-15AZ Datasheet - Page 188
![MCU AVR 16K FLASH 15MHZ 32-TQFP](/photos/6/91/69154/313-32-tqfp_sml.jpg)
ATMEGA168-15AZ
Manufacturer Part Number
ATMEGA168-15AZ
Description
MCU AVR 16K FLASH 15MHZ 32-TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA168-15AZ.pdf
(340 pages)
Specifications of ATMEGA168-15AZ
Package / Case
32-TQFP, 32-VQFP
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Operating Temperature
-40°C ~ 125°C
Speed
16MHz
Number Of I /o
23
Eeprom Size
512 x 8
Core Processor
AVR
Program Memory Type
FLASH
Ram Size
1K x 8
Program Memory Size
16KB (16K x 8)
Data Converters
A/D 8x10b
Oscillator Type
Internal
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Connectivity
I²C, SPI, UART/USART
Core Size
8-Bit
Cpu Family
ATmega
Device Core
AVR
Device Core Size
8b
Frequency (max)
16MHz
Interface Type
2-Wire/USART/Serial
Total Internal Ram Size
1KB
# I/os (max)
23
Number Of Timers - General Purpose
3
Operating Supply Voltage (typ)
3.3/5V
Operating Supply Voltage (max)
5.5V
Operating Supply Voltage (min)
2.7V
On-chip Adc
8-chx10-bit
Instruction Set Architecture
RISC
Operating Temp Range
-40C to 125C
Operating Temperature Classification
Automotive
Mounting
Surface Mount
Pin Count
32
Package Type
TQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
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17.9.5
17.10 Examples of Baud Rate Setting
Table 17-9.
188
Baud
Rate
(bps)
2400
4800
9600
14.4k
19.2k
28.8k
38.4k
ATmega48/88/168 Automotive
USART Baud Rate Registers – UBRRnL and UBRRnH
UBRR
n
25
12
6
3
2
1
1
U2Xn = 0
Examples of UBRRn Settings for Commonly Used Oscillator Frequencies
f
Error
-18.6%
osc
-7.0%
0.2%
0.2%
8.5%
8.5%
8.5%
= 1.0000 MHz
• Bit 15:12 – Reserved Bits
These bits are reserved for future use. For compatibility with future devices, these bit must be
written to zero when UBRRnH is written.
• Bit 11:0 – UBRR11:0: USART Baud Rate Register
This is a 12-bit register which contains the USART baud rate. The UBRRnH contains the four
most significant bits, and the UBRRnL contains the eight least significant bits of the USART
baud rate. Ongoing transmissions by the Transmitter and Receiver will be corrupted if the baud
rate is changed. Writing UBRRnL will trigger an immediate update of the baud rate prescaler.
For standard crystal and resonator frequencies, the most commonly used baud rates for asyn-
chronous operation can be generated by using the UBRRn settings in
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 resis-
tance when the error ratings are high, especially for large serial frames (see
Operational Range” on page
Bit
Read/Write
Initial Value
UBRR
n
51
25
12
8
6
3
2
U2Xn = 1
Error
-3.5%
-7.0%
0.2%
0.2%
0.2%
8.5%
8.5%
R/W
15
R
–
7
0
0
UBRR
n
47
23
11
7
5
3
2
R/W
U2Xn = 0
14
R
–
6
0
0
Error[%]
181). The error values are calculated using the following equation:
f
Error
osc
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
R/W
= 1.8432 MHz
13
=
R
–
5
0
0
BaudRate
------------------------------------------------------- - 1
UBRR
n
95
47
23
15
11
R/W
BaudRate
7
5
12
R
–
4
0
0
U2Xn = 1
UBRRn[7:0]
Closest Match
Error
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
0.0%
R/W
R/W
11
3
0
0
–
UBRR
n
R/W
R/W
51
25
12
10
UBRRn[11:8]
2
0
0
8
6
3
2
U2Xn = 0
100%
f
Error
osc
-3.5%
-7.0%
0.2%
0.2%
0.2%
8.5%
8.5%
R/W
R/W
9
1
0
0
= 2.0000 MHz
Table
UBRR
n
R/W
R/W
“Asynchronous
103
8
0
0
0
51
25
16
12
8
6
17-9. UBRRn
U2Xn = 1
7530I–AVR–02/10
UBRRnH
UBRRnL
Error
-3.5%
-7.0%
0.2%
0.2%
0.2%
2.1%
0.2%
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