By Douglas Summerville
The majority of desktops in use this present day are encapsulated inside of different platforms. not like general-purpose pcs that run an unending choice of software program, those embedded pcs are frequently programmed for a really particular, low-level and sometimes mundane function. Low-end microcontrollers, costing as low as one buck, are frequently hired through engineers in designs that make the most of just a small fraction of the processing strength of the equipment since it is both less expensive than deciding upon an application-specific half or simply because programmability bargains customized performance now not in a different way to be had. Embedded structures Interfacing for Engineers utilizing the Freescale HCS08 Microcontroller is a two-part publication meant to supply an creation to and software program interfacing for engineers. development from a complete advent of primary computing techniques, the e-book compatible for a primary path in desktop association for electric or machine engineering scholars with a minimum history in electronic common sense and programming. furthermore, this ebook should be invaluable as a reference for engineers new to the Freescale HCS08 kin of microcontrollers. The HCS08 processor structure utilized in the publication is comparatively easy to benefit, robust adequate to use in the direction of a wide-range of interfacing initiatives, and incorporates breadboard prototyping in a laboratory utilizing freely to be had and inexpensive instruments. partly II: electronic and Analog Interfacing, and software program interfacing thoughts are brought. The emphasis of this paintings is on strong and software program engineering layout ideas. equipment drivers are constructed illustrating using general-purpose and special-purpose electronic I/O interfaces, analog interfaces, serial interfaces and real-time I/O processing. The facet of every interface is defined and electric necessities and similar concerns are thought of. the 1st a part of the e-book presents the programming talents essential to enforce the software program during this half. desk of Contents: creation to the MC9S08QG4/8 / Analog enter / Serial communique / Real-Time I/O Processing
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Additional info for Embedded Systems Interfacing for Engineers using the Freescale HCS08 Microcontroller II: Digital and Analog Hardware Interfacing
15: Interrupt Request Status and Control Register. Disable) can be set to disable the internal pull-up resistor on the IRQ pin. IRQPDD is 0 by default, meaning the internal pull-up is enabled. IRQPE (IRQ Pin Enable) must be set to enable the IRQ function on pin 1 (disabled by default). IRQACK (IRQ ACKnowledge) is a write-only bit that is used to acknowledge the IRQ interrupt request, indicating that the external device has been serviced. Reading IRQACK always returns 0. The ISR for the IRQ pin must write a 1 to IRQACK (using a BSET instruction, for example) to clear the interrupt request.
PTASE1=1 to turn on slew rate control, and PTADS1=0 for low drive strength. 2. 3. GENERAL-PURPOSE DIGITAL I/O 17 Write the instructions necessary to configure pins PTB3, PTB2, PTB1, and PTB0 as input pins with pull-ups enabled, without changing the configuration of the other PTB pins. Solution:Since the entire Port is not being configured, data cannot be directly written to the data direction register or pull-up enable register. Thus, masking operations should be used. Solution: Since the entire Port is not being configured, data cannot be directly written to the data direction register or pull-up enable register.
13: Always-on, active-high and active-low LED circuit configurations. 4. 3V and a diode current of 5-10 mA is needed. 6)/(5 mA)= 340 . 6)/(10 mA)= 170 . Answer: value of R must satisfy 170 < R < 340 . 13. Ideally, when the output pin is set to logic 0, the pin is at 0V; when the output is set to logic 1, the pin is at VDD volts. In the active-low circuit, the LED is on when the output voltage is low and off when the output voltage is high. In the active-high configuration, the circuit has the opposite behavior (the LED is on when the output is high).