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參數資料
型號: MC68HCL05C9A
廠商: Motorola, Inc.
元件分類: 8位微控制器
英文描述: 8-Bit Microcontroller(8位微控制器)
中文描述: 8位微控制器(8位微控制器)
文件頁數: 84/160頁
文件大小: 783K
代理商: MC68HCL05C9A
L
G
R
Serial Communications Interface (SCI)
General Release Specification
MC68HC05C9A
Rev. 4.0
84
Serial Communications Interface (SCI)
MOTOROLA
9.14.4 SCI Status Register (SCSR)
The SCI status register, shown in
Figure 9-11
, contains flags to signal
the following conditions:
Transfer of SCDR data to transmit shift register complete
Transmission complete
Transfer of receive shift register data SCDR complete
Receiver input idle
Noisy data
Framing error
TDRE — Transmit Data Register Empty
This clearable, read-only flag is set when the data in the SCDR
transfers to the transmit shift register. TDRE generates an interrupt
request if the TIE bit in SCCR2 is also set. Clear the TDRE bit by
reading the SCSR with TDRE set and then writing to the SCDR. Reset
sets the TDRE bit. Software must initialize the TDRE bit to logic zero
to avoid an instant interrupt request when turning the transmitter on.
1 = SCDR data transferred to transmit shift register
0 = SCDR data not transferred to transmit shift register
TC — Transmission Complete
This clearable, read-only flag is set when the TDRE bit is set, and no
data, preamble, or break character is being transmitted. TDRE
generates an interrupt request if the TCIE bit in SCCR2 is also set.
Clear the TC bit by reading the SCSR with TC set, and then writing to
$0010
Bit 7
6
5
4
3
2
1
Bit 0
Read:
TDRE
TC
RDRF
IDLE
OR
NF
FE
Write:
Reset:
1
1
0
0
0
0
0
= Unimplemented
Figure 9-11. SCI Status Register (SCSR)
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相關代理商/技術參數
參數描述
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