參數(shù)資料
型號: MC68HC05C9ACFB
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQFP44
封裝: PLASTIC, QFP-44
文件頁數(shù): 140/160頁
文件大?。?/td> 4128K
代理商: MC68HC05C9ACFB
NON-DISCLOSURE
AGREEMENT
REQUIRED
Serial Communications Interface (SCI)
General Release Specification
MC68HC05C9A Rev. 4.0
Serial Communications Interface (SCI)
9.13 Transmit Data Out (TDO)
Transmit data is the serial data from the internal data bus that is applied
through the SCI to the output line. Data format is as discussed in 9.7
Data Format and shown in Figure 9-3. The transmitter generates a bit
time by using a derivative of the RT clock, thus producing a transmission
rate equal to 1/16th that of the receiver sample clock.
9.14 SCI I/O Registers
The following I/O registers control and monitor SCI operation:
SCI data register (SCDR)
SCI control register 1 (SCCR1)
SCI control register 2 (SCCR2)
SCI status register (SCSR)
9.14.1 SCI Data Register (SCDR)
The SCI data register, shown in Figure 9-8, is the buffer for characters
received and for characters transmitted.
9.14.2 SCI Control Register 1 (SCCR1)
The SCI control register 1, shown in Figure 9-9, has these functions:
Stores ninth SCI data bit received and ninth SCI data bit
transmitted
Controls SCI character length
Controls SCI wakeup method
$0011
Bit 7
6543
2
1
Bit 0
Read:
BIT7
BIT6
BIT55
BIT4
BIT3
BIT2
BIT1
BIT0
Write:
Reset:
Unaffected by Reset
Figure 9-8. SCI Data Register (SCDR)
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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