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Chapter 8 1. Which of control signal lines can be used in the off-chip memory expansion...

Chapter 8
1. Which of control signal lines can be used in the off-chip memory expansion of MCS-51 single chip microcomputer ? Please explain the functions of each control
signal line.
10. In single chip microcomputer, we use one chip EPROM2764 and one
SRAM6264 to expand memory storage. Assume the initial address of ROM is 000H, and the initial address of RAM is 2000H. Please draw the system circuit scheme, then show the address range clearly.

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Expert Solution

Ans: For external (off chip) memory expansion MCS-51 microcontroller uses three control signals which are listed and their functions are explained below;

  1. EA (External Access): It is an active low signal whenever there is need of external memory expansion then this EA signal is connected to ground. When there is no need of memory expansion then the signal EA is connected to Vcc.
  2. PSEN (Program store enable): This is also an active low pin. This pin is used to read the signal from external program memory during the time of external memory interfacing
  3. ALE (Address Latch Enable): In MCS 51 address and data bus are multiplexed in many ports. ALE signal is used for separating / DE multiplexing the address OR data signals of port 0 of MCS51


External memory interfacing for RAM as well as ROM is shown for ROM initial address is 0000H to FFFF Hso total addressable memory will be of 64 KB and for RAM initial address is 2000H to FFFFH so the total addressable memory will be 49,152 bytes which is 49KB's. This is shown in the interfacing diagram.

Manojponduru answered 2 years ago
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