SAM3X8E Atmel Corporation, SAM3X8E Datasheet - Page 757
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SAM3X8E
Manufacturer Part Number
SAM3X8E
Description
Manufacturer
Atmel Corporation
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Figure 34-5. Receiver Ready
34.5.2.4
Figure 34-6. Receiver Overrun
34.5.2.5
Figure 34-7. Parity Error
34.5.2.6
11057A–ATARM–17-Feb-12
11057A–ATARM–17-Feb-12
RXRDY
URXD
RXRDY
OVRE
URXD
RXRDY
URXD
PARE
S
S
Receiver Overrun
Parity Error
Receiver Framing Error
D0
D0
S
D1
D1
D0
D2
D2
If UART_RHR has not been read by the software (or the Peripheral Data Controller or DMA
Controller) since the last transfer, the RXRDY bit is still set and a new character is received, the
OVRE status bit in UART_SR is set. OVRE is cleared when the software writes the control regis-
ter UART_CR with the bit RSTSTA (Reset Status) at 1.
Each time a character is received, the receiver calculates the parity of the received data bits, in
accordance with the field PAR in UART_MR. It then compares the result with the received parity
bit. If different, the parity error bit PARE in UART_SR is set at the same time the RXRDY is set.
The parity bit is cleared when the control register UART_CR is written with the bit RSTSTA
(Reset Status) at 1. If a new character is received before the reset status command is written,
the PARE bit remains at 1.
When a start bit is detected, it generates a character reception when all the data bits have been
sampled. The stop bit is also sampled and when it is detected at 0, the FRAME (Framing Error)
bit in UART_SR is set at the same time the RXRDY bit is set. The FRAME bit remains high until
the control register UART_CR is written with the bit RSTSTA at 1.
D1
D3
D3
D2
D4
D4
D3
D5
D5
D4
D6
D6
D5
D7
D7
D6
P
Wrong Parity Bit
P
D7
stop
P
S
S
stop
D0
Read UART_RHR
D0
D1
D1
D2
D2
D3
RSTSTA
D3
D4
D4
D5
D5
D6
D6
D7
D7
SAM3X/A
SAM3X/A
P
P
stop
RSTSTA
757
757
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