UART with compressed user accessible interrupt codes

Details UART with compressed user accessible interrupt codes UART with compressed user accessible interrupt codes

2005-09-20

2005-09-20

Najjar, Saleh (Department: 2157)

Electrical computers and digital processing systems: multicomput

Computer-to-computer data addressing

C709S232000, C709S253000, C710S001000, C710S008000

Reexamination Certificate

active

06947999

ABSTRACT:
An improved UART which has a number of channels, with each channel having a set of channel configuration registers. Each channel configuration register includes an interrupt source register. The interrupt source register has a multi-bit interrupt source code which is used to indicate the source of the interrupt. This code is chosen to be compatible with prior UART devices. The device also includes a bus interface, and a plurality of device configuration registers accessible through the bus interface by a user. One of the device configuration registers is an interrupt register which provides a user accessible code to indicate the interrupt source. The code used for the interrupt source is a compressed version of the multiple bit code used in the channel configuration interrupt source register. This compression allows more channels to be represented in a single register, while also conveying the interrupt source information quickly to the user. Since the device interrupt register in the configuration registers is for access by the user, rather than internal access by UART drivers, there is no need for compatibility with the prior UART drivers.

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Philips Semiconductors; IC 19 Data Handbook; Integrated Circuit Data Sheet SCC2698B Enhanced octal universal asynchronous receiver/transmitter (Octal UART); Sep. 4, 1998; pp. 2-28.
Phillips Semiconductors; IC 19 Data Handbook; Integrated Circuit Data Sheet SC28L198 Octal UART for 3.3V and 5V supply voltage; Jan. 14, 1999; pp. 2-56.

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