Question
In: Electrical Engineering
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.
Solutions
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;
- 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.
- 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
- 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 1 year agoRelated Solutions
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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