參數(shù)資料
型號: MC68HC05C8A
廠商: Motorola, Inc.
英文描述: Microcontrollers
中文描述: 微控制器
文件頁數(shù): 71/158頁
文件大?。?/td> 773K
代理商: MC68HC05C8A
Serial Communications Interface (SCI)
SCI Data Format
MC68HC05C8A
MC68HCL05C8A
MC68HSC05C8A
Rev. 5.0
Technical Data
MOTOROLA
Serial Communications Interface (SCI)
71
9.4 SCI Data Format
The SCI uses the standard non-return-to-zero mark/space data format
illustrated in
Figure 9-1
.
Figure 9-1. SCI Data Format
9.5 SCI Operation
The SCI allows full-duplex, asynchronous, RS232 or RS422 serial
communication between the MCU and remote devices, including other
MCUs. The SCI
s transmitter and receiver operate independently,
although they use the same baud-rate generator. This subsection
describes the operation of the SCI transmitter and receiver.
9.5.1 Transmitter
Figure 9-2
shows the structure of the SCI transmitter.
9.5.1.1 Character Length
The transmitter can accommodate either 8-bit or 9-bit data. The state of
the M bit in SCI control register 1 (SCCR1) determines character length.
When transmitting 9-bit data, bit T8 in SCCR1 is the ninth bit (bit 8).
8-BIT DATA FORMAT
(BIT M IN SCCR1 CLEAR)
9-BIT DATA FORMAT
(BIT M IN SCCR1 SET)
START
BIT
BIT 0
BIT 1
BIT 2
BIT 3
BIT 4
BIT 5
BIT 6
BIT 7
BIT 8
STOP
BIT
NEXT
START
BIT
BIT 0
BIT 1
BIT 2
BIT 3
BIT 4
BIT 5
BIT 6
BIT 7
START
BIT
STOP
BIT
NEXT
START
BIT
相關(guān)PDF資料
PDF描述
MC68HC05C9A 8-Bit Microcontroller(8位微控制器)
MC68HCL05C9A 8-Bit Microcontroller(8位微控制器)
MC68HSC05C9A 8-Bit Microcontroller(8位微控制器)
MC68HC05F2 8-Bit Microcontroller Units (MCU).(8位微控制器)
MC68HC05F6 8-Bit Microcontroller Units (MCU).(8位微控制器)
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