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HT85F2270 bảng dữ liệu(PDF) 200 Page - Holtek Semiconductor Inc

tên linh kiện HT85F2270
Giải thích chi tiết về linh kiện  Standard 8051 8-Bit Flash MCU
PDF  226 Pages
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nhà sản xuất  HOLTEK [Holtek Semiconductor Inc]
Trang chủ  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT85F2270 bảng dữ liệu(HTML) 200 Page - Holtek Semiconductor Inc

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Rev. 1.00
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Standard 8051 8-Bit Flash MCU
HT85F2260/HT85F2270/HT85F2280
UART0 Operating Description
This section provides a more detailed description of the UART0 structure and operation. The
following shows the overall UART0 block diagram.
UART0 Baud Rate
Transmit Shift Register
Control Unit
Output
Latch
RXD0
RI0
TI0
Receive Shift Register
Input
Latch
S0BUF
RXD0
TXD0
�CU Data Bus
UART 0 Block Diagram
UART0 External Pin Interfacing
To communicate with an external serial interface, the UART0 has two external pins known as
TXD0 and RXD0. The UART0 provides four operating modes which can be categorised into
two transmitter/receiver methods, so called Synchronous and Asynchronous. In Synchronous
communication, the MCU must be the master device and the TXD0 pin is used to provide the
shift clock while the RXD0 pin is used as the data transmitter/receiver pin. In Asynchronous
communication, which does require a clock signal, the TXD0 pin is used to transmit data while the
RXD0 pin is used as the data receive pin. The TXD0 and RXD0 pins are pin shared with I/O pins.
When the UART0 function is disabled, controlled by the REN0 bit in the S0CON register, these
two pins can be used as general purpose I/O pins.



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