參數資料
型號： MC68HC05C8MFB
廠商： MOTOROLA 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： QFP-44
文件頁數： 123/156頁
文件大小： 1755K
代理商： MC68HC05C8MFB
Serial Communications Interface (SCI)
SCI Data Format
MC68HC05C8A — Rev. 4.0
Advance Information
MOTOROLA
Serial Communications Interface (SCI)
69
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).
9.5.1.2 Character Transmission
During transmission, the transmit shift register shifts a character out to
the PD1/TDO pin. The SCI data register (SCDR) is the write-only buffer
between the internal data bus and the transmit shift register.
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PDF資料
PDF描述
MC68HC05C8FN 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQCC44
MC68HC05C8B 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP42
MC68HC05C8FB 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQFP44
MC68HC05C8MB 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP42
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