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8085 Articles
Page 2 of 36
Generation of .HEX file using a linker
The file MULT.ASM which is created by using an editor is simply a text file. We cannot execute this file directly. At first we have to assemble the file, and then we have to link it. The step of assembly the translation of the program of assembly language to machine code requires the generation of a .OBJ file.Now a .HEX file is generated by using a linker. We have seen previously that how the naming of the input and output file is done.Input filenameThe source name of the file must be responded by the user. In the given example the ...
Read More8085 Program for subtraction of multi-Byte BCD numbers
Now let us see a program of Intel 8085 Microprocessor. In this program we will see how to subtract multi-Byte BCD numbers.Problem StatementWrite 8085 Assembly language program to subtract two multi-Byte BCD numbers.DiscussionThe numbers are stored into memory, and one additional information is stored. It will show us the Byte count of the multi-Byte BCD number. Here we are choosing 3-Byte BCD numbers. They are stored at location 8001H to 8003H, and another number is stored at location 8004H to 8006H. The location 8000H is holding the Byte count. In this case the Byte count is 03H.For the subtraction we ...
Read MorePin diagram of 8212
We find 8212 available in nowadays as a package chip which is dual inline having 24 pins total. We find its functional pin diagram below.Fig: Pin diagram of 8212 functionalFig: Pin diagram of 8212Voltage of + 5 V is required for it to work based on the supply which is DC. The latch which is 8 bit in 8212 receives the information which is present on the eight data inputs ranging from DI7 to D10. The condition which helps in information latching is present on DI7 to DI0 depends on the state of logic of the pin which is of ...
Read MoreIntel 8212 in mode 0
The below fig shows clearly how 8212 works in the mode 0Fig: 8212 working in mode 0We use this mode generally when we want 8212 to function like an input port. An input device gets connected to DI7-0, and the microprocessor employed here receives the information on DOs ranging from D7-D0. Here in this mode STB acts as clock for the given latches. The latch which is of 8 bits in 8212 follows the series information which is present on DI7 to DI0 as long as STB is equal to 1. When the STB makes a transition, which is high ...
Read MoreIntel 8212 in mode 1
The figure below shows the working of 8212 in mode 1Fig: Working of 8212 in mode 1We use this mode generally when we want 8212 to function as an output port. Here, microprocessor drives DI7-0, and the device at the output receives the information on Do7-0. The clock to the latches is provided in this mode. 8212 latches the information on DI7-0 when the CS makes transition from high to low. The CS signal gets activates when INT* is transferred by the interrupts by the driven data transfer scheme which is always performed when desired. The buffer at the output ...
Read MoreApplications of 8212 in mode 0
We use Intel 8212 in variety of applications. Let us discuss applications of 8212 in Mode 0It acts as buffer which is gatedBus driver which is Bi-directionalFor Interrupting the input portTo supply of eight instructions based on RST.Intel 8212 as gated buffer: A weak logic signal is converted to a strong logic when 8212 works in logic 0. The outputs of 8212 in mode0 is capable of sinking the 15 mA in 0 state, and which proves that a minimum high output voltage of nearly 3.65 V is in the state 1. Intel8212 is always given backup when the input ...
Read MoreApplications of 8212 in mode 1
Let's discuss the Following two applicationsLow order address latchOutput port which is interrupting.Intel 8212 as low-order address latch − Here the low-order address lines and data lines are multiplexed and are available as AD7-0. It is convenient to have the address as many times and the separation of data on the different lines. Let's for an example, if we connect a chip like 2716 in an 8085-based system, the 2716 needs bit address of11 bits in its address pins, and here is separate 8 pins kept for data. Now connecting the AD7-0 pins of 8085 to the LS 8 address ...
Read More8085 program to exchange content of HL register pair with DE register pair
In this program we will see how to exchange the content of DE and HL pair.Problem StatementWrite 8085 Assembly language program to swap the content of HL and DE register pair.DiscussionThis process is very simple, 8085 has XCHG instruction. This instruction swaps DE and HL pair content. We are storing some values to DE and HL pair directly, and then exchange them using XCHG.InputDE = 5678H HL = CDEFHFlow DiagramProgramAddressHEX CodesMnemonicsCommentsF00016, 56MVI D, 56HLoad D with56HF0021E, 78MVI E, 78HLoad D with78HF00426, CDMVI H, CDHLoad D with CDHF0062E, EFMVI L, EFHLoad D withEFHF008EBXCHGExchange the content of DE and HLF00976HLTTerminate the programOutputDE ...
Read More8085 program to find sum of digits of 8 bit number
In this program we will see how to add the digits of an 8-bit number.Problem StatementWrite 8085 Assembly language program to add the digits of an 8-bit number stored in memory location 8000H.DiscussionTo get the digits of an 8-bit number, we can use the masking operation. At first we will mask the upper nibble, and then the lower nibble. After masking the lower nibble, we have to rotate it to the right to make it least significant nibble. Then we can simply add it to the stored nibble to get the sum.InputAddressData......80008A......ProgramAddressHEX CodesMnemonicsCommentsF0003A, 00, 80LDA 8000HLoad the number into AF0034FMOV ...
Read MoreUse of 8259 in an 8086-based system
The interrupt requests are accepted by 8259 from eight interrupting devices on the pin ranging fromIR0 toIR7. After that, it identifies the priority interrupt having the highest request from the inputs which are active. It is possible for us to configure the 8259 for the mode of operation of "fixed priority" mode.Here, among the priorities, IR0 has the highest and IR7 has the lowest. If the three inputs IR2, IR4, and IR6 are in active state, then IR2 will have is the highest priority interrupt request than the other active requests. We can mask the requests of the interrupts by installing ...
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