AT90PWM2B-16SE ATMEL [ATMEL Corporation], AT90PWM2B-16SE Datasheet - Page 218
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AT90PWM2B-16SE
Manufacturer Part Number
AT90PWM2B-16SE
Description
8-bit Microcontroller with 8K Bytes In-System Programmable Flash
Manufacturer
ATMEL [ATMEL Corporation]
Datasheet
1.AT90PWM2B-16SE.pdf
(361 pages)
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19.4.4
19.4.5
19.4.6
19.4.7
19.5
19.5.1
19.5.2
218
Data Reception – EUSART Receiver
AT90PWM2/3/2B/3B
Sending 17 Data Bit Frames
Transmitter Flags and Interrupts
Disabling the Transmitter
Data Reception – EUSART Receiver
Receiving Frames with 5 to 8 Data Bits
Receiving Frames with 9, 13, 14, 15 or 16 Data Bits
In this configuration the seventeenth bit shoud be loaded in the RXB8 bit register, the rest of the
most significant bits (9, 10, 11, 12, 13, 14, 15 and 16) should be loaded in the EUDR register,
before the low byte of the character is written to UDR.
The behavior of the EUSART is the same as in USART mode (See “Receive Complete Flag and
Interrupt”).
The interrupts generation and handling for transmission in EUSART mode are the same as in
USART mode.
The disabling of the Transmitter (setting the TXEN to zero) will not become effective until ongo-
ing and pending transmissions are completed, i.e., when the Transmit Shift Register and
Transmit Buffer Register do not contain data to be transmitted.
The EUSART Receiver is enabled by writing the Receive Enable (RXEN) bit in the UCSRB Reg-
ister to one (same as USART). When the Receiver is enabled, the normal pin operation of the
RxD pin is overridden by the EUSART and given the function as the Receiver’s serial input. The
baud rate, mode of operation and frame format must be set up once before any serial reception
can be done. If synchronous operation is used, the clock on the XCK pin will be used as transfer
clock.
In this mode the behavior is the same as the standard USART (See “Receiving Frames with 5 to
8 Data Bits” in USART section).
In these configurations the most significant bits (9, 13, 14, 15 or 16) should be read in the EUDR
register before reading the of the character in the UDR register.
Read status from EUCSRC, then data from UDR.
4317J–AVR–08/10
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