Boots – shoes – and leggings
Patent
1992-04-24
1993-06-08
Fleming, Michael R.
Boots, shoes, and leggings
395725, 3642597, 364DIG1, 3649474, 364DIG2, G06F 900
Patent
active
052186830
ABSTRACT:
A status word modification device. A serial communications device (11) contains two universal asynchronous receiver transmitters (UARTs) (14, 15). Each UART contains a first in, first out (FIFO) buffer (14a), two status buffers (14b, 14c), and a FIFO control register (14d). If the applications program in the host (10) is an enhanced application program which supports the use of the FIFO buffer (14a), then the program will cause FIFO enablement instructions to be written into the control register (14d). In this case, the interface circuit (22) allows the status words to pass unaltered whenever the host (10) reads the status buffers (14b, 14c). However, if the applications program is a standard applications program which does not support the use of the FIFO buffer (14a), then the program will not write to the control register (14d). In this case, the interface circuit (22) will alter the value of selected bits of the status words if the user has enabled the FIFO buffer (14a) and the host reads the status buffers (14b, 14c). The alteration of the status word prevents the standard applications program from treating the FIFO-related bits in the status words as data errors.
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Jerrim John W.
Swanson Scott C.
Auve Glenn A.
Fleming Michael R.
Hayes Microcomputer Products, Inc.
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