Unit1_2_8086_ARCHITECTURE - 8086 Features 16-bit...

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T.RANGA BABU,Dept.of ECE 1 • 16-bit ALU (Arithmetic Logic Unit) • 16-bit DATA BUS (8088 has 8-bit data bus) • 20-bit ADDRESS BUS - 2 20 = 1,048,576 = 1 MEGA The address refers to a byte in memory. In the 8088 , these bytes come in on the 8-bit data bus. In the 8086 , bytes at EVEN addresses come in on the low half of the data bus (bits 0-7) and ODD addresses come in on the upper half of the data bus (bits 8-15). The 8086 can read a 16-bit word at an EVEN address in one operation and at an ODD address in two operations. The 8088 needs two operations in either case. The least significant byte of a word on an 8086 family microprocessor is at the lower address. 8086 Features
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T.RANGA BABU,Dept.of ECE 2
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