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MC68HC908GR4MP bảng dữ liệu(PDF) 162 Page - Freescale Semiconductor, Inc

tên linh kiện MC68HC908GR4MP
Giải thích chi tiết về linh kiện  M68HC08 Microcontrollers
PDF  286 Pages
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nhà sản xuất  FREESCALE [Freescale Semiconductor, Inc]
Trang chủ  http://www.freescale.com
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MC68HC908GR4MP bảng dữ liệu(HTML) 162 Page - Freescale Semiconductor, Inc

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Serial Communications Interface (SCI)
MC68HC908GR8 • MC68HC908GR4 Data Sheet, Rev. 7
162
Freescale Semiconductor
18.3 Pin Name Conventions
The generic names of the SCI I/O pins are:
•
RxD (receive data)
•
TxD (transmit data)
SCI I/O (input/output) lines are implemented by sharing parallel I/O port pins. The full name of an SCI
input or output reflects the name of the shared port pin. Table 18-1 shows the full names and the generic
names of the SCI I/O pins.
The generic pin names appear in the text of this chapter.
18.4 Functional Description
Figure 18-1 shows the structure of the SCI module. The SCI allows full-duplex, asynchronous, NRZ serial
communication among the MCU and remote devices, including other MCUs. The transmitter and receiver
of the SCI operate independently, although they use the same baud rate generator. During normal
operation, the CPU monitors the status of the SCI, writes the data to be transmitted, and processes
received data.
The baud rate clock source for the SCI can be selected via the configuration bit, SCIBDSRC, of the
CONFIG2 register ($001E).
Table 18-1. Pin Name Conventions
Generic Pin Names:
RxD
TxD
Full Pin Names:
PE1/RxD
PE0/TxD



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