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4.5.1
USART
4.5.2
CONFIGURATION AND CLOCK HEADERS
North Star HSIO-4
USART is an acronym for Universal
Synchronous/Asynchronous Receiver/Transmitter.
The USART can be programmed from the processor
to communicate in most commonly used types of
serial data transmission. The USART receives
serial data streams and converts them into
parallel data bytes for input to the
processor. While receiving serial data, the
USART will also accept data bytes from the
processor in parallel format, convert them to
serial format and transmit them. By performing
conversion and formatting services
automatically, the USART appears to the
processor as a simple device for input or
output of byte-oriented parallel data. A
control register within the USART determines
parameters. A complete USART status byte,
including data format, error and status
signals such as Transmitter Empty, Transmitter
Ready, and Synchronous Detect, is available to
the processor at any time. For the convenience
of users requiring more detailed information,
a manufacturer data sheet for the USART is
reproducd in Appendix B, along with notes on
the Interface to the USART.
Various connections on the Configuration
Header and the Clock Header for a port permit
several types of serial transmission. The
header configurations determine how the USART
connects to the port connector and the baud
rate signals.
61
User/Technical Manual
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