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HT85F2270 bảng dữ liệu(PDF) 210 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) 210 Page - Holtek Semiconductor Inc

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Rev. 1.00
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Standard 8051 8-Bit Flash MCU
HT85F2260/HT85F2270/HT85F2280
UART1 Operating Description
This section provides a more detailed description of the UART1 structure and operation. The
following shows the overall UART1 block diagram.
UART1 Baud Rate
Transmit Shift Register
Control Unit
Output
Latch
RXD1
RI1
TI1
Receive Shift Register
Input
Latch
S1BUF
TXD1
�CU Data Bus
UART1 Block Diagram
UART1 External Pin Interfacing
To communicate with an external serial interface, the internal UART1 each has two external
pins known as TXD1 and RXD1. The UART1 provides two operating modes both of which use
Asynchronous communication. The TXD1 pin is used to transmit data while the RXD1 pin is
used as the data reception pin. The TXD1 and RXD1 pins are pin shared with I/O pins. When the
UART1 function is disabled, controlled by the REN1 bit in the S1CON register, these two pins can
be used as general purpose I/O pins.



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