參數(shù)資料
型號(hào)： AT91M40807-33AI
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： Microcontroller
中文描述： 32-BIT, MROM, 33 MHz, RISC MICROCONTROLLER, PQFP100
封裝： 1.40 MM HEIGHT, TQFP-100
文件頁數(shù)： 102/153頁
文件大?。?/td> 1837K
代理商： AT91M40807-33AI
102
AT91X40 Series
1354D
–
ATARM
–
05/02
Synchronous Receiver
When configured for synchronous operation (SYNC = 1), the receiver samples the RXD
signal on each rising edge of the Baud Rate clock. If a low level is detected, it is consid-
ered as a start. Data bits, parity bit and stop bit are sampled and the receiver waits for
the next start bit. See example in Figure 40.
Figure 40.
Synchronous Mode: Character Reception
Receiver Ready
When a complete character is received, it is transferred to the US_RHR and the RXRDY
status bit in US_CSR is set. If US_RHR has not been read since the last transfer, the
OVRE status bit in US_CSR is set.
Parity Error
Each time a character is received, the receiver calculates the parity of the received data
bits, in accordance with the field PAR in US_MR. It then compares the result with the
received parity bit. If different, the parity error bit PARE in US_CSR is set.
Framing Error
If a character is received with a stop bit at low level and with at least one data bit at high
level, a framing error is generated. This sets FRAME in US_CSR.
Time-out
This function allows an idle condition on the RXD line to be detected. The maximum
delay for which the USART should wait for a new character to arrive while the RXD line
is inactive (high level) is programmed in US_RTOR (Receiver Time-out). When this reg-
ister is set to 0, no time-out is detected. Otherwise, the receiver waits for a first character
and then initializes a counter which is decremented at each bit period and reloaded at
each byte reception. When the counter reaches 0, the TIMEOUT bit in US_CSR is set.
The user can restart the wait for a first character with the STTTO (Start Time-out) bit in
US_CR.
Calculation of time-out duration:
D0
D1
D2
D3
D4
D5
D6
D7
RXD
True Start Detection
Sampling
Parity Bit
Stop Bit
Example: 8-bit, parity enabled 1 stop
SCK
Duration
=
Value x
4
x
Bit period
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