ATMEGA64-16AI Atmel, ATMEGA64-16AI Datasheet - Page 191

• Manufacturer Part Number: ATMEGA64-16AI
• Description: IC AVR MCU 64K 16MHZ IND 64-TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA64-16AI

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 53
• Program Memory Size: 64KB (32K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 2K x 8
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TQFP, 64-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

UCSRnC – USART
Control and Status
Register C
2490Q–AVR–06/10
(1)
• Bit 1 – RXB8n: Receive Data Bit 8
RXB8n is the ninth data bit of the received character when operating with serial frames with nine
data bits. Must be read before reading the low bits from UDRn.
• Bit 0 – TXB8n: Transmit Data Bit 8
TXB8n is the ninth data bit in the character to be transmitted when operating with serial frames
with nine data bits. Must be written before writing the low bits to UDRn.
Note:
• Bit 7 – Reserved Bit
This bit is reserved for future use. For compatibility with future devices, this bit must be written to
zero when UCSRC is written.
• Bit 6 – UMSELn: USART Mode Select
This bit selects between asynchronous and synchronous mode of operation.
Table 77. UMSEL Bit Settings
• Bit 5:4 – UPMn1:0: Parity Mode
These bits enable and set type of parity generation and check. If enabled, the Transmitter will
automatically generate and send the parity of the transmitted data bits within each frame. The
Receiver will generate a parity value for the incoming data and compare it to the UPMn0 setting.
If a mismatch is detected, the UPEn flag in UCSRnB will be set.
Table 78. UPM Bits Settings
Bit
Read/Write
Initial Value
UPMn1
1. This register is not available in ATmega103 compatibility mode.
UMSELn
0
0
1
1
0
1
R/W
7
–
0
UMSELn
R/W
6
0
UPMn0
Mode
Asynchronous Operation
Synchronous Operation
UPMn1
0
1
0
1
R/W
5
0
UPMn0
R/W
4
0
Parity Mode
Disabled
Reserved
Enabled, Even Parity
Enabled, Odd Parity
USBSn
R/W
3
0
UCSZn1
R/W
2
1
UCSZn0
R/W
1
1
ATmega64(L)
UCPOLn
R/W
0
0
UCSRnC
191