參數(shù)資料
型號(hào): ST72361AR6TA
廠(chǎng)商: STMICROELECTRONICS
元件分類(lèi): 微控制器/微處理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP64
封裝: 10 X 10 MM, ROHS COMPLIANT, PLASTIC, TQFP-64
文件頁(yè)數(shù): 64/224頁(yè)
文件大?。?/td> 4821K
代理商: ST72361AR6TA
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ST72361-Auto
156/224
LINSCI
SERIAL COMMUNICATION INTERFACE (LIN Master Only) (Cont’d)
10.8.4.3 Receiver
The SCI can receive data words of either 8 or 9
bits. When the M bit is set, word length is 9 bits
and the MSB is stored in the R8 bit in the SCICR1
register.
Character reception
During a SCI reception, data shifts in least signifi-
cant bit first through the RDI pin. In this mode, the
SCIDR register consists or a buffer (RDR) be-
tween the internal bus and the received shift regis-
Procedure
– Select the M bit to define the word length.
– Select the desired baud rate using the SCIBRR
and the SCIERPR registers.
– Set the RE bit, this enables the receiver which
begins searching for a start bit.
When a character is received:
– The RDRF bit is set. It indicates that the content
of the shift register is transferred to the RDR.
– An interrupt is generated if the RIE bit is set and
the I bit is cleared in the CCR register.
– The error flags can be set if a frame error, noise
or an overrun error has been detected during re-
ception.
Clearing the RDRF bit is performed by the following
software sequence done by:
1. An access to the SCISR register
2. A read to the SCIDR register.
The RDRF bit must be cleared before the end of the
reception of the next character to avoid an overrun
error.
Break Character
When a break character is received, the SCI han-
dles it as a framing error.
Idle Character
When an idle frame is detected, there is the same
procedure as a data received character plus an in-
terrupt if the ILIE bit is set and the I bit is cleared in
the CCR register.
Overrun Error
An overrun error occurs when a character is re-
ceived when RDRF has not been reset. Data can-
not be transferred from the shift register to the
RDR register until the RDRF bit is cleared.
When a overrun error occurs:
– The OR bit is set.
– The RDR content is not lost.
– The shift register is overwritten.
– An interrupt is generated if the RIE bit is set and
the I bit is cleared in the CCR register.
The OR bit is reset by an access to the SCISR reg-
ister followed by a SCIDR register read operation.
Noise Error
Oversampling techniques are used for data recov-
ery by discriminating between valid incoming data
and noise.
When noise is detected in a frame:
– The NF is set at the rising edge of the RDRF bit.
– Data is transferred from the Shift register to the
SCIDR register.
– No interrupt is generated. However this bit rises
at the same time as the RDRF bit which itself
generates an interrupt.
The NF bit is reset by a SCISR register read oper-
ation followed by a SCIDR register read operation.
Framing Error
A framing error is detected when:
– The stop bit is not recognized on reception at the
expected time, following either a de-synchroni-
zation or excessive noise.
– A break is received.
When the framing error is detected:
– the FE bit is set by hardware
– Data is transferred from the Shift register to the
SCIDR register.
– No interrupt is generated. However this bit rises
at the same time as the RDRF bit which itself
generates an interrupt.
The FE bit is reset by a SCISR register read oper-
ation followed by a SCIDR register read operation.
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