参数资料
型号: MC68LNC705C9ACFN
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQCC44
封装: PLASTIC, LCC-44
文件页数: 172/177页
文件大小: 1941K
代理商: MC68LNC705C9ACFN
Serial Communications Interface (SCI)
Advance Information
MC68HC705C9A — Rev. 4.0
94
Serial Communications Interface (SCI)
MOTOROLA
Figure 9-7. SCI Start Bit Following a Break
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
The SCI data register (SCDR), shown in Figure 9-8, is the buffer for
characters received and for characters transmitted.
EXPECTED STOP
DATA SAMPLES
DETECTED AS VALID START EDGE
START BIT
RDI
BREAK
START
QUALIFIERS
START EDGE
VERIFICATION
SAMPLES
$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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