May 2024
Intermediate to advanced
889 pages
30h 8m
English
book
The X 86 Microprocessors: Architecture, Programming and Interfacing (8086 to Pentium) 2nd Edition by Pearson
by Lyla B. Das
Content preview from The X 86 Microprocessors: Architecture, Programming and Interfacing (8086 to Pentium) 2nd Edition by Pearson
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PERIPHERAL INTERFACING–III 11-33
Process) signal, de-asserts its HRQ pin, lowers the AEN signal and releases the system
bus, so that the process can resume its normal operation.
11.6.4 | Initialization and Programming the 8237
Continuing with the idea of programming the 8237 chip, let us see the registers it has for
command, status and modes. Since we have designed the logic of CS as in Fig. 11.22,
the addresses of these registers are as in Table 11.4.
Command/Status Register The command register is the register used for controlling
the operation of the DMA chip. For that, the register must be written to. The same
register is used as a status ...
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