Two devices are connected by a asynchronous serial link UART) as discussed in class and in the text and lab manual. For all parts of this question, the sender is configured at 28000 paud, 7 data bits, 2 stop bits. Note that ASCII codes are in Appendix E, page 791. The ASCII code of a 'B' is send continuously from this same sender using the following 68000 code: TXBSY TXOUT equ equ $FFFFFA00 $FFFFFA02 ;initialization etc. in here ;'B' to do ;check busy bit ;back if still busy ;the 'B' output ;back until again not busy #$42, do moveq btst.b #0,TXBSY bne move.b do, TXOUT bra chkser chkser chkser f the timing of the instructions can be determined by the humber of memory cycles, calculate the approximate proportion of time actually spent putting data into the UART to he amount of time just testing to see if the UART is busy. Assume each memory cycle takes 100nsec.
Two devices are connected by a asynchronous serial link UART) as discussed in class and in the text and lab manual. For all parts of this question, the sender is configured at 28000 paud, 7 data bits, 2 stop bits. Note that ASCII codes are in Appendix E, page 791. The ASCII code of a 'B' is send continuously from this same sender using the following 68000 code: TXBSY TXOUT equ equ $FFFFFA00 $FFFFFA02 ;initialization etc. in here ;'B' to do ;check busy bit ;back if still busy ;the 'B' output ;back until again not busy #$42, do moveq btst.b #0,TXBSY bne move.b do, TXOUT bra chkser chkser chkser f the timing of the instructions can be determined by the humber of memory cycles, calculate the approximate proportion of time actually spent putting data into the UART to he amount of time just testing to see if the UART is busy. Assume each memory cycle takes 100nsec.
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Question
![Two devices are connected by a asynchronous serial link
(UART) as discussed in class and in the text and lab manual.
For all parts of this question, the sender is configured at 28000
baud, 7 data bits, 2 stop bits. Note that ASCII codes are in
Appendix E, page 791.
The ASCII code of a 'B' is send continuously from this same
sender using the following 68000 code:
$FFFFFA00
$FFFFFA02
TXBSY
equ
equ
TXOUT
;initialization etc. in here
#$42, do
;'B' to do
;check busy bit
;back if still busy
;the 'B' output
;back until again not busy
moveq
chkser btst.b #0,TXBSY
bne
move.b do, TXOUT
bra
chkser
chkser
If the timing of the instructions can be determined by the
number of memory cycles, calculate the approximate
proportion of time actually spent putting data into the UART to
the amount of time just testing to see if the UART is busy.
Assume each memory cycle takes 100nsec.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F71658ce0-4e15-497d-b51f-a8b7c5fba060%2F3171a8de-379d-4d43-ba09-b054af612f8f%2F7mx0uo_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Two devices are connected by a asynchronous serial link
(UART) as discussed in class and in the text and lab manual.
For all parts of this question, the sender is configured at 28000
baud, 7 data bits, 2 stop bits. Note that ASCII codes are in
Appendix E, page 791.
The ASCII code of a 'B' is send continuously from this same
sender using the following 68000 code:
$FFFFFA00
$FFFFFA02
TXBSY
equ
equ
TXOUT
;initialization etc. in here
#$42, do
;'B' to do
;check busy bit
;back if still busy
;the 'B' output
;back until again not busy
moveq
chkser btst.b #0,TXBSY
bne
move.b do, TXOUT
bra
chkser
chkser
If the timing of the instructions can be determined by the
number of memory cycles, calculate the approximate
proportion of time actually spent putting data into the UART to
the amount of time just testing to see if the UART is busy.
Assume each memory cycle takes 100nsec.
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