May 2024
Intermediate to advanced
665 pages
23h 2m
English
book
The X86 Microprocessors: Architecture and Programming (8086 to Pentium), 1st Edition
by Lyla B. Das
Content preview from The X86 Microprocessors: Architecture and Programming (8086 to Pentium), 1st Edition
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368 THE x86 MICROPROCESSORS
00EEEXXX
RETURN
(Indicates the Column)
SCAN
(Indicates the row)
SHIFT
CNTRL
Figure 10.17 | Return key code
from the columns to the chip. e idea is that the scan lines cause ‘lows’ to be outputted on the
rows and the status of the columns are returned to the chip. Remember that this is the same
as the principle of keyboard interfacing discussed in Section 9.12, but here, the 8279 does this
automatically in response to the control words we use.
e return key code which is produced has a format as shown in Fig 10.17. is code is
stored in an eight-byte FIFO RAM where FIFO stands for ‘First-In First-Out’. is RAM
thus ...
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