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QWhat is the function of the memory refresh register in Z80?

ID: #10417 Embedded System 126 views
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#10417Q ID
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Embedded SystemTopic
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  • A To control on-chip SRAM ✔ ✖
  • B To control on-chip DRAM ✔ ✖
  • C To clear cache ✔ ✖
  • D To control ROM ✔ ✖
Correct Answer: Option B

Explanation

The memory refresh register in Z80 is responsible for refreshing on-chip DRAM. Dynamic RAM (DRAM) is volatile memory that requires constant refreshing to maintain its data. The Z80 processor has built-in refresh circuitry that automatically refreshes DRAM, eliminating the need for external refresh circuitry in embedded designs. This feature was one of the reasons why the Z80 was widely used in embedded systems.

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