ATMEGA8515L-8JC Atmel, ATMEGA8515L-8JC Datasheet - Page 157
ATMEGA8515L-8JC
Manufacturer Part Number
ATMEGA8515L-8JC
Description
IC AVR MCU 8K LV 8MHZ COM 44PLCC
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA8515L-8JC
Core Processor
AVR
Core Size
8-Bit
Speed
8MHz
Connectivity
EBI/EMI, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
35
Program Memory Size
8KB (4K x 16)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
0°C ~ 70°C
Package / Case
44-PLCC
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Data Converters
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USART Control and Status
Register C – UCSRC
2512K–AVR–01/10
Writing this bit to one enables the USART Transmitter. The Transmitter will override nor-
mal port operation for the TxD pin when enabled. The disabling of the Transmitter
(writing TXEN to zero) will not become effective until ongoing and pending transmis-
sions are completed. For example, when the Transmit Shift Register and Transmit
Buffer Register do not contain data to be transmitted. When disabled, the Transmitter
will no longer override the TxD port.
• Bit 2 – UCSZ2: Character Size
The UCSZ2 bits combined with the UCSZ1:0 bit in UCSRC sets the number of data bits
(character size) in a frame the Receiver and Transmitter use.
• Bit 1 – RXB8: Receive Data Bit 8
RXB8 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 UDR.
• Bit 0 – TXB8: Transmit Data Bit 8
TXB8 is the ninth data bit in the character to be transmitted when operating with serial
frames with 9 data bits. Must be written before writing the low bits to UDR.
The UCSRC Register shares the same I/O location as the UBRRH Register. See the
“Accessing UBRRH/UCSRC Registers” on page 153 which describes how to access
this register.
• Bit 7 – URSEL: Register Select
This bit selects between accessing the UCSRC or the UBRRH Register. It is read as
one when reading UCSRC. The URSEL must be one when writing the UCSRC.
• Bit 6 – UMSEL: USART Mode Select
This bit selects between asynchronous and synchronous mode of operation.
Table 63. UMSEL Bit Settings
• Bit 5:4 – UPM1:0: Parity Mode
These bits enable and set type of parity generation and check. If enabled, the Transmit-
ter 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 com-
pare it to the UPM0 setting. If a mismatch is detected, the PE Flag in UCSRA will be set.
Bit
Read/Write
Initial Value
UMSEL
0
1
URSEL
R/W
7
1
UMSEL
R/W
6
0
Mode
Asynchronous Operation
Synchronous Operation
UPM1
R/W
5
0
UPM0
R/W
4
0
USBS
R/W
3
0
UCSZ1
R/W
2
1
ATmega8515(L)
UCSZ0
R/W
1
1
UCPOL
R/W
0
0
UCSRC
157
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