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8251
1.
2.
3.
4.
5.
6.
7.
8.
FIGURE 9-4
Block diagram and pin definitions for the 8259A Programmable Interrupt Controller (PIC). (Courtesy of Intel Corporation.) John Uffenbeck The 80x86 Family: Design, Programming, and Interfacing, 3e Copyright ©2002 by Pearson Education, Inc. Upper Saddle River, New Jersey 07458 All rights reserved.
9.
FIGURE 9-5
Interfacing the PIC to the 386 and 486 processors. Two I/O ports are required. John Uffenbeck The 80x86 Family: Design, Programming, and Interfacing, 3e Copyright ©2002 by Pearson Education, Inc. Upper Saddle River, New Jersey 07458 All rights reserved.
10.
FIGURE 9-7
All interrupt requests must pass through the PICâs interrupt request register (IRR) and interrupt mask register (IMR). If put in service, the appropriate bit of the in-service (IS) register is set. John Uffenbeck The 80x86 Family: Design, Programming, and Interfacing, 3e Copyright ©2002 by Pearson Education, Inc. Upper Saddle River, New Jersey 07458 All rights reserved.
11.
Example of two
cascaded PICs
12.
13.
FIGURE 9-8
(a) Simultaneous interrupt requests arrive on IR4 and IR6. IR4 has highest priority and its IS bit is set as the IR4 service routine is put in service. (b) The IR4 service routine issues a rotate-on-nonspecific-EOI command, resetting IS4 and assigning it lowest priority. IR6 is now placed in service. (c) The IR6 service routine issues a rotate-on-nonspecific-EOI command, resetting IS6 and assigning it lowest priority. John Uffenbeck The 80x86 Family: Design, Programming, and Interfacing, 3e Copyright ©2002 by Pearson Education, Inc. Upper Saddle River, New Jersey 07458 All rights reserved.
14.
FIGURE 9-9
Example illustrating the difference between the rotate-on-nonspecific-EOI command and the rotate-on-specific-EOI command. John Uffenbeck The 80x86 Family: Design, Programming, and Interfacing, 3e Copyright ©2002 by Pearson Education, Inc. Upper Saddle River, New Jersey 07458 All rights reserved.
15.
16.
FIGURE 9-11
8259A initialization control word format. (Courtesy of Intel Corporation.) John Uffenbeck The 80x86 Family: Design, Programming, and Interfacing, 3e Copyright ©2002 by Pearson Education, Inc. Upper Saddle River, New Jersey 07458 All rights reserved.
17.
FIGURE 9-12
8259A initialization sequence. (Courtesy of Intel Corporation.) John Uffenbeck The 80x86 Family: Design, Programming, and Interfacing, 3e Copyright ©2002 by Pearson Education, Inc. Upper Saddle River, New Jersey 07458 All rights reserved.
18.
FIGURE 9-13
8259A operation control word format. (Courtesy of Intel Corporation.) John Uffenbeck The 80x86 Family: Design, Programming, and Interfacing, 3e Copyright ©2002 by Pearson Education, Inc. Upper Saddle River, New Jersey 07458 All rights reserved.
19.
20.
FIGURE 9-17
A DMA controller allows the peripheral to interface directly with memory without processor intervention. This allows the data transfer rate to approach the access time of memory. John Uffenbeck The 80x86 Family: Design, Programming, and Interfacing, 3e Copyright ©2002 by Pearson Education, Inc. Upper Saddle River, New Jersey 07458 All rights reserved. Types: Sequential DMA Simultaneous DMA
21.
FIGURE 9-18
Three methods (MODES ) of DMA operation: (a) byte; (b) burst; (c) block. John Uffenbeck The 80x86 Family: Design, Programming, and Interfacing, 3e Copyright ©2002 by Pearson Education, Inc. Upper Saddle River, New Jersey 07458 All rights reserved.
22.
23.
24.
25.
FIGURE 10-5
(a) Serial data transmitted at the proper rate. (b) The data rate is too fast. (c) The data rate is too slow. John Uffenbeck The 80x86 Family: Design, Programming, and Interfacing, 3e Copyright ©2002 by Pearson Education, Inc. Upper Saddle River, New Jersey 07458 All rights reserved.
26.
Serial Frame (Synchronous)
Bit 7 0 1 2 3 4 5 6 7 0 No start or stop bits, timing synchronized with special ASCII characters (SYN) Time
27.
FIGURE 10-2
One-bit input and output port. With appropriate software this circuit can function as a serial I/O channel. John Uffenbeck The 80x86 Family: Design, Programming, and Interfacing, 3e Copyright ©2002 by Pearson Education, Inc. Upper Saddle River, New Jersey 07458 All rights reserved.
28.
29.
UART / CPU
interface CPU 8251 status (8 bit) data (8 bit) serial port xmit/ rcv
30.
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