ATmega32A Atmel Corporation, ATmega32A Datasheet - Page 171

• Manufacturer Part Number: ATmega32A
• Manufacturer: Atmel Corporation

Specifications of ATmega32A

• Flash (kbytes): 32 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): 2
• Eeprom (bytes): 1024
• 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

19.11.5
8155C–AVR–02/11
UBRRL and UBRRH – USART Baud Rate Registers
Table 19-6.
• Bit 2:1 – UCSZ1:0: Character Size
The UCSZ1:0 bits combined with the UCSZ2 bit in UCSRB sets the number of data bits (Char-
acter Size) in a frame the Receiver and Transmitter use.
Table 19-7.
• Bit 0 – UCPOL: Clock Polarity
This bit is used for Synchronous mode only. Write this bit to zero when Asynchronous mode is
used. The UCPOL bit sets the relationship between data output change and data input sample,
and the synchronous clock (XCK).
Table 19-8.
The UBRRH Register shares the same I/O location as the UCSRC Register. See the
UBRRH/ UCSRC Registers” on page 165
Bit
Read/Write
Initial Value
UCPOL
0
1
UCSZ2
0
0
0
0
1
1
1
1
Transmitted Data Changed (Output of TxD
Pin)
Rising XCK Edge
Falling XCK Edge
USBS Bit Settings
UCSZ Bits Settings
UCPOL Bit Settings
URSEL
USBS
R/W
R/W
15
7
0
0
0
1
R/W
14
R
–
6
0
0
UCSZ1
0
0
1
1
0
0
1
1
R/W
13
R
–
5
0
0
section which describes how to access this register.
R/W
12
R
–
4
0
0
UBRR[7:0]
UCSZ0
0
1
0
1
0
1
0
1
R/W
R/W
11
3
0
0
Received Data Sampled (Input on RxD
Pin)
Falling XCK Edge
Rising XCK Edge
R/W
Stop Bit(s)
R/W
10
2
0
0
UBRR[11:8]
1-bit
2-bit
R/W
R/W
Character Size
9
1
0
0
ATmega32A
Reserved
Reserved
Reserved
5-bit
6-bit
7-bit
8-bit
9-bit
R/W
R/W
8
0
0
0
“Accessing
UBRRH
UBRRL
171