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参数资料
| 型号： | MC68HC05C9EFB |
| 厂商： | MOTOROLA 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： | 130/144页 |
| 文件大小： | 1628K |
| 代理商： | MC68HC05C9EFB |
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Serial Communications Interface (SCI)
Advance Information
MC68HC05C9E
86
Serial Communications Interface (SCI)
MOTOROLA
the SCDR. Reset sets the TC bit. Software must initialize the TC bit
to logic 0 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 Flag
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 Flag
This clearable, read-only flag is set when 10 or 11 consecutive
logic 1s 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 Flag
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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