參數(shù)資料
型號: MC68HC05C9A
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(shù): 80/160頁
文件大?。?/td> 783K
代理商: MC68HC05C9A
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Serial Communications Interface (SCI)
General Release Specification
MC68HC05C9A
Rev. 4.0
80
Serial Communications Interface (SCI)
MOTOROLA
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
6
5
4
3
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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