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Section 12 UART
12.1
Overview
The UART module is 16550 compatible. This module performs the serial to parallel conversion on
received data, and parallel to serial conversion on transmitted data. Individually, they contain a
programmable baud rate generator that is capable of dividing the input clock by a number from 1
to 65535; the data rate of each can also be programmed from 115.2K baud down to 50 baud. The c
haracter options are programmable for 1 start bit; 1, 1.5, or 2 stop bits; even, odd, stick or no
parity; and privileged interrupts. The HD64465 provides two UART ports.
12.2
Features
•
Programmable FIFO or character mode
•
In FIFO mode 16-byte FIFO buffer on the transmitter and receiver
•
Add or delete standard asynchronous communication bits (start, stop, parity) to or from serial
data.
•
The programmable Baud rate generator allows the division of input clock by 1 to 2
16
-1 and
generates internal 16X clock
•
MODEM control function (CTS#, RTS#, DTR#, DSR#, RI#, DCD#)
•
Fully programmable serial-interface characteristics:
•
5, 6, 7 or 8 bit characters
•
Even, odd, forced 0/1 or no parity bit generation and detection
•
1 ½, or 2 stop bit generation
•
Baud rate generation (Dc to 115.2K baud)
•
False start bit detection
•
Two UART ports are provided (UART0 and UART1)
Содержание HD64465
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