Thanks What is tho name given to a routine that is executed in response to an In

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Thanks What is tho name given to a routine that is executed in response to an Interrupt What are the advantages of using interrupts to handle data inputs and outputs What are the requirements for interrupt processing How do you enable other interrupts when the HCS12 is executing an interrupt service routine Why would there be a need to promote one of the maskable interrupts to the highest priority among all maskable interrupts Write the assembler directives to initialize the IRQ interrupt vector located at $3000 for the EVB mode of the D-8ug12 monitor. What is the last instruction in most interrupt servce routines What does this instruction do Suppose that the HCS12 Is executing the following instruction segment and the IRQ Interrupt occurs when the TSY instruction is being executed. What will be the contents of the top 10 bytes m the stack ORG $2000 LDS #$2000 CLRA LDX #$0 BSET 10.X $48 LDAB #$40 INCA TAP PSHB TSY ADDA #10 4.3 Write a subroutine to convert all the lowercase letters

Explanation / Answer

Wait mode

HCS12 microcontroller consists of logic gates that consume power during switching. The power consumption merely depends upon the operation frequency. The power consumption of HCS12 is 2mA/MHz is almost linear against bus frequency in run mode. This microcontroller family also features a very flexible PLL (Phase Locked Loop) that allows for choosing a low-frequency quartz or ceramic resonator hence achieving low power consumption when PLL is OFF. One can stop the CPU execution and selectively disable some modules so that only the used modules are clocked. This is the idea of the WAIT mode on HCS12. For even lower power consumption, the bus clock can be routed to only the Real Time Interrupt timer (RTI) and not across the whole chip. This is called the pseudo-stop mode on HCS12.

Stop Mode

The ultimate low-power configuration is to shutdown the oscillator circuitry. We are then in stop mode. The remaining power consumption comes from leakage currents that are highly dependent on ambient temperature.

STOP is the instruction for stop mode and WAI for wait mode

The STOP and WAI instructions are imposed on the CPU by stacking the CPU registers in advance. Directly after that, the appropriate clock signals are stopped. In both cases, it uses the address of the following instruction as the return address for the Interrupt Service Routine (ISR) that is called by the wake-up event.

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