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- 2012-11-26
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Description: When CE = 0, IO/M = 0, the 8155 can only do chip RAM to use, a total of 256 B. The address range from well AD0 ~ AD7 the connection decision, which referred to the previous extended-chip RAM to discuss the same. When the system while expanding off-chip RAM chips, both should pay attention to the unity of addressing. The operation of this 256 B RAM chip RAM using read/write instruction " MOVX" . Expanding the I/O available when CE = 0, IO/M = 1, the point can be within the three 8155 I/O ports, and command/status registers, and timer/counter operation. And I/O ports and the use of the internal counter register a total of 6, you need to distinguish between the three addresses.
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