at91cap7e ATMEL Corporation, at91cap7e Datasheet - Page 271
at91cap7e
Manufacturer Part Number
at91cap7e
Description
Customizable Microcontroller
Manufacturer
ATMEL Corporation
Datasheet
1.AT91CAP7E.pdf
(520 pages)
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Figure 26-10. Character Transmission
26.4.4.3
Figure 26-11. Transmitter Control
26.4.5
8549A–CAP–10/08
Shift Register
DBGU_THR
TXEMPTY
TXRDY
DTXD
Peripheral Data Controller
in DBGU_THR
Write Data 0
Transmitter Control
Baud Rate
Example: Parity enabled
DTXD
Clock
S
Data 0
in DBGU_THR
PARE in the mode register DBGU_MR defines whether or not a parity bit is shifted out. When a
parity bit is enabled, it can be selected between an odd parity, an even parity, or a fixed space or
mark bit.
When the transmitter is enabled, the bit TXRDY (Transmitter Ready) is set in the status register
DBGU_SR. The transmission starts when the programmer writes in the Transmit Holding Regis-
ter DBGU_THR, and after the written character is transferred from DBGU_THR to the Shift
Register. The bit TXRDY remains high until a second character is written in DBGU_THR. As
soon as the first character is completed, the last character written in DBGU_THR is transferred
into the shift register and TXRDY rises again, showing that the holding register is empty.
When both the Shift Register and the DBGU_THR are empty, i.e., all the characters written in
DBGU_THR have been processed, the bit TXEMPTY rises after the last stop bit has been
completed.
Write Data 1
Both the receiver and the transmitter of the Debug Unit's UART are generally connected to a
Peripheral Data Controller (PDC) channel.
The peripheral data controller channels are programmed via registers that are mapped within
the Debug Unit user interface from the offset 0x100. The status bits are reported in the Debug
Unit status register DBGU_SR and can generate an interrupt.
Start
Bit
Data 0
D0
Data 0
D1
P
D2
stop
D3
S
D4
D5
Data 1
Data 1
D6
D7
Parity
Bit
P
Stop
Bit
AT91CAP7E
Data 1
stop
271
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