C8085

Intel C8085 40-pin ceramic DIP Purple ceramic/black top/tin pins M. Krishna Kumar MM/M1/LU2/V1/2004 1 8085 Microprocessor The salient features of 8085 µp are : It is a 8 bit microprocessor. It is manufactured with N-MOS technology. It has 16 bit address bus and hence can address upto 216 = 65536 bytes (64KB) memory locations through A0-A15. The first 8 lines of address bus and 8 lines of data bus are multiplexed AD0 – AD7. M. Krishna Kumar MM/M1/LU2/V1/2004 2 8085 Microprocessor ( cont..) Data bus is a group of 8 lines D0 – D7. It supports external interrupt request. A 16 bit program counter (PC) A 16 bit stack pointer (SP) Six 8-bit general purpose register arranged in pairs: BC, DE, HL. It requires a signal +5V power supply and operates at 6.144 MHZ single phase clock. It is enclosed with 40 pins DIP ( Dual in line package ). M. Krishna Kumar MM/M1/LU2/V1/2004 3 8085 Microprocessor ( cont..) Memory: Program, data and stack memories occupy the same memory space. The total addressable memory size is 64 KB. Program memory - program can be located anywhere in memory. Jump, branch and call instructions use 16-bit addresses, i.e. they can be used to jump/branch anywhere within 64 KB. All jump/branch instructions use absolute addressing. M. Krishna Kumar MM/M1/LU2/V1/2004 4 8085 Microprocessor ( cont..) Data memory - the processor always uses 16-bit addresses so that data can be placed anywhere. Stack memory is limited only by the siz...