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参数资料
型号： MC68HCL05C9AFB
厂商： FREESCALE SEMICONDUCTOR INC
元件分类： 微控制器/微处理器
英文描述： 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQFP44
封装： QFP-44
文件页数： 145/160页
文件大小： 4128K
代理商： MC68HCL05C9AFB
Serial Communications Interface (SCI)
SCI I/O Registers
MC68HC05C9A — Rev. 4.0
General Release Specification
Serial Communications Interface (SCI)
NON-DISCLOSURE
AGREEMENT
REQUIRED
the SCDR. Reset sets the TC bit. Software must initialize the TC bit
to logic zero to avoid an instant interrupt request when turning the
transmitter on.
1 = No transmission in progress
0 = Transmission in progress
RDRF — Receive Data Register Full
This clearable, read-only flag is set when the data in the receive shift
register transfers to the SCI data register. RDRF generates an
interrupt request if the RIE bit in the SCCR2 is also set. Clear the
RDRF bit by reading the SCSR with RDRF set and then reading the
SCDR.
1 = Received data available in SCDR
0 = Received data not available in SCDR
IDLE — Receiver Idle
This clearable, read-only flag is set when 10 or 11 consecutive logic
ones appear on the receiver input. IDLE generates an interrupt
request if the ILIE bit in the SCCR2 is also set. Clear the ILIE bit by
reading the SCSR with IDLE set and then reading the SCDR.
1 = Receiver input idle
0 = Receiver input not idle
OR — Receiver Overrun
This clearable, read-only flag is set if the SCDR is not read before the
receive shift register receives the next word. OR generates an
interrupt request if the RIE bit in the SCCR2 is also set. The data in
the shift register is lost, but the data already in the SCDR is not
affected. Clear the OR bit by reading the SCSR with OR set and then
reading the SCDR.
1 = Receive shift register full and RDRF = 1
0 = No receiver overrun
NF — Receiver Noise Flag
This clearable, read-only flag is set when noise is detected in data
received in the SCI data register. Clear the NF bit by reading the
SCSR and then reading the SCDR.
1 = Noise detected in SCDR
0 = No noise detected in SCDR
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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