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In a microcomputer, the microprocessor unit (MPU) is always communicating with one of the following: (1) Random Access Memory(RAM). which stores programs and data that can be readily changed; (2) Read Only Memory (ROM), which stores programs and data that never input/output (1/o) such as keyboards, video displays, printers, and disk drives. As it is executing a program, the MPU will generate an address code that selects which type of device (RAM, ROM, or 1/0) it wants to communicate with. The figure below shows a typical arrangement where the MPU outputs an eight-bit address code A15 through As. Actually, the MPU outputs a 16-bit address code, but the lower bit A7 through Ao are not used in the device selection process. The address code is applied to a logic circuit which uses it to generate the device select signals: RAM, ROM, and I1/0. change: (3) external

In a microcomputer, the microprocessor unit (MPU) is always communicating with one of the following: (1) Random Access Memory(RAM). which stores programs and data that can be readily changed; (2) Read Only Memory (ROM), which stores programs and data that never input/output (1/o) such as keyboards, video displays, printers, and disk drives. As it is executing a program, the MPU will generate an address code that selects which type of device (RAM, ROM, or 1/0) it wants to communicate with. The figure below shows a typical arrangement where the MPU outputs an eight-bit address code A15 through As. Actually, the MPU outputs a 16-bit address code, but the lower bit A7 through Ao are not used in the device selection process. The address code is applied to a logic circuit which uses it to generate the device select signals: RAM, ROM, and I1/0. change: (3) external

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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In a microcomputer, the microprocessor unit (MPU) is always communicating with one of the following: (1) Random Access Memory (RAM), which stores programs and data that can be readily changed; (2) Read Only Memory (ROM), which stores programs and data that never input/output (1/o) such as keyboards, video displays, printers, and disk drives. As it is executing a program, the MPU will generate an address code that selects which type of device (RAM, ROM, or I/0) it wants to communicate with. The figure below shows a typical arrangement where the MPU outputs an eight-bit address code A15 through As. Actually, the MPU outputs a 16-bit address code, but the lower bit A7 through Ao are not used in the device selection process. The address code is applied to a logic circuit which uses it to generate the device select signals: RAM, ROM, and I/0. change; (3) external Ais A14 RAM A12 1/0 MPU A ROM Analyze this circuit and determine the following: a. the range of address Al15 through A8 that will activate the RAM b. the range of address es that activate 1/0 and c. the range of address es that activate ROM. Express the addresses in binary and hexad ecimal. For example, the answer to a is A15 to A8 = 000000002 to 111011112 = 0016 to EF16.
Transcribed Image Text:In a microcomputer, the microprocessor unit (MPU) is always communicating with one of the following: (1) Random Access Memory (RAM), which stores programs and data that can be readily changed; (2) Read Only Memory (ROM), which stores programs and data that never input/output (1/o) such as keyboards, video displays, printers, and disk drives. As it is executing a program, the MPU will generate an address code that selects which type of device (RAM, ROM, or I/0) it wants to communicate with. The figure below shows a typical arrangement where the MPU outputs an eight-bit address code A15 through As. Actually, the MPU outputs a 16-bit address code, but the lower bit A7 through Ao are not used in the device selection process. The address code is applied to a logic circuit which uses it to generate the device select signals: RAM, ROM, and I/0. change; (3) external Ais A14 RAM A12 1/0 MPU A ROM Analyze this circuit and determine the following: a. the range of address Al15 through A8 that will activate the RAM b. the range of address es that activate 1/0 and c. the range of address es that activate ROM. Express the addresses in binary and hexad ecimal. For example, the answer to a is A15 to A8 = 000000002 to 111011112 = 0016 to EF16.
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