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參數資料
型號: MC68HC05C8A
廠商: Motorola, Inc.
英文描述: Microcontrollers
中文描述: 微控制器
文件頁數: 74/158頁
文件大?。?/td> 773K
代理商: MC68HC05C8A
Serial Communications Interface (SCI)
Technical Data
MC68HC05C8A
MC68HCL05C8A
MC68HSC05C8A
Rev. 5.0
74
Serial Communications Interface (SCI)
MOTOROLA
9.5.1.4 Idle Characters
An idle character contains all logic 1s and has no start or stop bits. Idle
character length depends on the M bit in SCCR1. The preamble is a
synchronizing idle character that begins every transmission.
Clearing the TE bit during a transmission relinquishes the PD1/TDO pin
after the last character to be transmitted is shifted out. The last character
may already be in the shift register, or waiting in the SCDR, or in a break
character generated by writing to the SBK bit. Toggling TE from logic 0
to logic 1 while the last character is in transmission generates an idle
character (a preamble) that allows the receiver to maintain control of the
PD1/TDO pin.
9.5.1.5 Transmitter Interrupts
Two sources can generate SCI transmitter interrupt requests:
1.
Transmit data register empty (TDRE)
The TDRE bit in the
SCSR indicates that the SCDR has transferred a character to the
transmit shift register. TDRE is a source of SCI interrupt requests.
The transmission complete interrupt enable bit (TCIE) in SCCR2
is the local mask for TDRE interrupts.
2.
Transmission complete (TC)
The TC bit in the SCSR indicates
that both the transmit shift register and the SCDR are empty and
that no break or idle character has been generated. TC is a source
of SCI interrupt requests. The transmission complete interrupt
enable bit (TCIE) in SCCR2 is the local mask for TC interrupts.
9.5.2 Receiver
Figure 9-3
shows the structure of the SCI receiver.
相關PDF資料
PDF描述
MC68HC05C9A 8-Bit Microcontroller(8位微控制器)
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相關代理商/技術參數
參數描述
MC68HC05C8ACFN 制造商:Motorola Inc 功能描述:MicroController, 8-Bit, 44 Pin, Plastic, PLCC
MC68HC05C9 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:TECHNICAL DATA
MC68HC05C9A 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers
MC68HC05C9AB 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers
MC68HC05C9AFB 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers
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