February
Tuesday 3 April 2018 photo 4/44
|
Ei instruction in 8085: >> http://adb.cloudz.pw/download?file=ei+instruction+in+8085 << (Download)
Ei instruction in 8085: >> http://adb.cloudz.pw/read?file=ei+instruction+in+8085 << (Read Online)
The Enable Interrupts (EI) and Disable Interrupts (DI) instructions authorise the microprocessor to allow or reject interrupts. In case of EI, the interrupts will be enabled following the completion of the next instruction following the EI. In the DI, the interrupts are disabled immediately and no flags are affected.
Jan 7, 2009 INTERRUPT INSTRUCTIONS: The Enable Interrupts (EI) and Disable Interrupts (DI) instructions allow the MP to permit or deny interrupts under program control. For the EI, the interrupts will be enabled following the completion of the next instruction following the EI. For the DI, the interrupts are disabled immediately.
May 7, 2011 For example in critical time delays, this instruction is used at the beggining of the code and interrupts are enabled at the end of the code. EI – Enable Interrupt –>> Byte – 1 –>> M-cycles – 1 –>> T-states – 4 –>> Description – The interrupt enable flip flop is set and all interrupts are enabled. –>> Use – After a
May 14, 2017 The maskable interrupt process in the 8085 is controlled by a single flip flop inside the microprocessor. This Interrupt Enable flip flop is controlled using the two instructions “EI" and “DI". The 8085 has a single Non-Maskable interrupt. The non-maskable interrupt is not affected by the value of the Interrupt
The interrupt process can be described by the following steps: 1.The interrupt should be enabled by writing the instruction EI in main program. 2 .When The microprocessor is executing a program , it check the INTR during executing of each instruction. 3 .If the line INTR is high , the microprocessor send INTA (acknowledge).
Oct 22, 2013 The 8085 Interrupts • • • • When a device interrupts, it actually wants the MP to give a service which is equivalent to asking the MP to call a subroutine. This subroutine is called ISR (Interrupt Service Routine) The 'EI' instruction is a one byte instruction and is used to Enable the non-maskable interrupts.
Oct 2, 2015 The 8085 RIM (Read Interrupt Mask) and SIM (Set Interrupt Mask) instructions are confusing because they have two completely unrelated functions: serial bit indicates whether interrupts are enabled (1) using the EI (Enable Interrupts) instruction, or disabled (0) using the DI (Disable Interrupts) instruction.
EI(Enable Interrupt): - The interrupt enable flip-flop is set and all interrupts are enabled. No flags are affected. After a system reset or the acknowledgement of an interrupt, the interrupt enable flipflop is reset, thus disabling the interrupts. This instruction is necessary to reenable the interrupts (except TRAP). Eg: - EI. 5.
1 1 1 1 1 0 1 1 N The interrupt system is enabled using EI instruction. When this instruction is executed, then INTE F/F is set so that all the interrupts are enabled and 8085 A will recognize external interrupt request except those that are masked.
Annons
Visa toppen
Show footer