ATA6613 ATMEL Corporation, ATA6613 Datasheet - Page 194
ATA6613
Manufacturer Part Number
ATA6613
Description
Ata6613
Manufacturer
ATMEL Corporation
Datasheet
1.ATA6613.pdf
(362 pages)
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ATA6612/ATA6613
Figure 6-69. USART Block Diagram
Note:
The dashed boxes in the block diagram separate the three main parts of the USART (listed from
the top): Clock Generator, Transmitter and Receiver. Control Registers are shared by all units.
The Clock Generation logic consists of synchronization logic for external clock input used by
synchronous slave operation, and the baud rate generator. The XCKn (Transfer Clock) pin is
only used by synchronous transfer mode. The Transmitter consists of a single write buffer, a
serial Shift Register, Parity Generator and Control logic for handling different serial frame for-
mats. The write buffer allows a continuous transfer of data without any delay between frames.
The Receiver is the most complex part of the USART module due to its clock and data recovery
units. The recovery units are used for asynchronous data reception. In addition to the recovery
units, the Receiver includes a Parity Checker, Control logic, a Shift Register and a two level
receive buffer (UDRn). The Receiver supports the same frame formats as the Transmitter, and
can detect Frame Error, Data OverRun and Parity Errors.
1. Refer to
Table 6-38 on page 104
UCSRnA
TRANSMIT SHIFT REGISTER
RECEIVE SHIFT REGISTER
BAUD RATE GENERATOR
UDRn(Receive)
UDRn(Transmit)
UBRRn [H:L]
(1)
for USART0 pin placement.
UCSRnB
GENERATOR
SYNC LOGIC
RECOVERY
RECOVERY
CHECKER
PARITY
PARITY
CLOCK
OSC
DATA
Clock Generator
CONTROL
Transmitter
CONTROL
CONTROL
CONTROL
CONTROL
Receiver
PIN
PIN
PIN
RX
TX
UCSRnC
9111C–AUTO–02/08
XCKn
RxDn
TxDn
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