参数资料
型号: MC68HC05C8AMP
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP40
封装: PLASTIC, DIP-40
文件页数: 136/166页
文件大小: 1914K
代理商: MC68HC05C8AMP
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
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