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EXAMPLE 146 Writing Data to and Reading Data from I/O Ports
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Write speci ed data to an I/O address Assume that an input device is connected to the address E6H Write the code necessary to read a byte from this input device
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Known Quantities: Desired data, I/O address Find: Write the appropriate sequence of commands using the MC68HC05 instruction set Schematics, Diagrams, Circuits, and Given Data: The data to be written to the I/O port is 36H (decimal number 36); the I/O address is A6H Assumptions: Data is written to the accumulator register rst Analysis:
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The command to write to an I/O port is STA$ address The command assumes that the data is in the accumulator register, thus we rst must load the accumulator with the desired value: LDA #$36 STA $00A6 ; load accumulator with 36H ; write accumulator to I/O port A6H
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The command to read from an I/O port is LDA address The value read from the input port is stored in the accumulator To store the byte into the accumulator register we use the command: LDA $00E6 ; load accumulator with E6H
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Comments: The CD-ROM that accompanies this book contains the complete instruction
set for the MC68HC05 microcontroller
Operation of the Central Processing Unit (CPU) The M68HC05 is organized as follows Five CPU registers can be directly accessed by the CPU (ie, without the need to access memory); the memory map de nes the names and types of the memory locations that are accessible to the CPU in addition to the registers The accumulator, or A register, is used to hold the results of arithmetic operations performed by the CPU The index, or X register, is used to point to an address in memory where the CPU will read or write information This register is used to perform a function called indexed addressing, which is described in more detail in the M68HC05 instruction set found in the accompanying CD-ROM
14
Digital Systems
The program counter (PC) register keeps track of the address of the next instruction to be executed by the CPU The condition code register (CCR) holds information that re ects the status of prior CPU operations For example, branch instructions look at the CCR to make either/or decisions The stack pointer (SP) register contains return address information and the previous content of all CPU registers, so that if the CPU is interrupted or a subroutine is initiated (we shall visit this concept soon), the status of the program prior to the interrupt or prior to branching to the subroutine is retained Once the CPU has nished servicing the interrupt or has completed the subroutine, it can resume its previous operations by loading the contents of the SP register
Interrupts Interrupts perform a very important function in microcontrollers by allowing the CPU to interrupt is normal ow of operations to respond to an external event For example, an interrupt request may occur when an analog-to-digital converter (described in more detail in 15) has completed the conversion of an analog signal to digital form, so that the digital value of a sensor reading may be made available to the CPU for further processing The following Focus on Measurements illustrates an automotive application of this concept
FOCUS ON MEASUREMENTS
Reading Sensor Data By Using Interrupts
In modern automotive instrumentation, a microprocessor performs all of the signal-processing operations for several measurements A block diagram for such instrumentation is given in Figure 1434 Depending on the technology used, the sensors outputs can be either digital or analog If the sensor signals are analog, they must be converted to digital format by means of an analog-to-digital converter (ADC), as shown in Figure 1435 The analog-to-digital conversion process requires an amount of time that depends on the individual ADC, as will be explained in 15 After the conversion is completed, the ADC then signals the computer by changing the logic state on a separate line that sets its interrupt request ip op This ip- op stores the ADC s interrupt request until it is acknowledged (see Figure 1436) When an interrupt occurs, the processor automatically jumps to a designated program location and executes the interrupt service subroutine For the ADC, this would be a subroutine to read the conversion results and store them in some appropriate location, or to perform an operation on them When the processor responds to the interrupt, the interrupt request ip- op is cleared by a direct signal from the processor To resume the execution of the program at the proper point upon completion of the ADC service subroutine, the program counter content is automatically saved before control is transferred to the service subroutine The service subroutine saves in a stack the content of any registers it uses, and restores the registers content before returning
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