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In the register-register model, memory (which stores the variables) is accessed only using the load- and-store instructions. Hence here, the registers are first loaded with the variable values, the computation is performed with the result back in one of the registers, and the result from this register is stored back in the destination variable. The register-memory and the register-register architecture processors have a large number of registers that are orthogonal in nature. Any register can be used in any operation. Typically, such architectures have 32 general-purpose registers. Early processor architectures used either the stack or the accumulator model. However, most modern processors use the register-register architecture. This is because of the realization that accessing internal registers is much faster than accessing external memory. To reduce external memory accesses, a large pool of general-purpose registers is provided for the register-register model. Moreover, registers are easier to access for a compiler than say a stack, even though the stack is inside the processor.
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2.2 Choosing a Microcontroller
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There are literally hundreds of microprocessors and microcontrollers on the market, and choosing a particular one for your application can be a nightmare. Usually one starts by enumerating one s requirements in terms of features and cost and then comparing these with what is available. The final choice may still be dictated by other factors such as market trends, company profile, popularity, local design expertise, etc. Listed below are some of the popular 8-bit microcontrollers and their features. These devices are the lowest cost-representative devices from respective manufacturers.
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Two 16-bit timers, UART, fixedpoint 32-bit arithmetic unit, DMA controller 8-bit timer, analog comparator, watchdog, on-chip oscillator, one external interrupt Four clocks per machine cycle, UART, three 16-bit timer/counters, dual data pointers, ten internal/six external interrupts, power-on reset Three 8-bit timers, one 16-bit timer, one 14-bit PWM timer, one watchdog, two SCI ports, eight 8-bit ADC, 32-kHz subclock generator
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Atmel Corp
ATtiny11
1-kbyte flash
Dallas Semi
DS80C310
256-byte RAM
Hitachi
H8/3640
8-kbyte ROM 512 byte RAM
CHOOSING A MICROCONTROLLER 17
COMPANY
DEVICE
MEMORY
OTHER FEATURES
Infineon Microchip
C501 PIC16CR54C
8-kbyte ROM 256-bytes RAM 768-byte ROM, 25-byte RAM
Serial interface, three 16-bit timers, 32 I/O ports 12 I/O pins, 8-bit timer, highcurrent sink/source for direct LED drive, watchdog timer, RC oscillator 2.2 to 5.5V operation; 16-bitwide address bus; three 8-bit timers; 16-bit watchdog timer; 10-bit, eight-channel ADC; UART; one clock-synchronized serial port; one external interrupt, seven high-current output ports for LED operation; key-on wake-up function, 29 programmable-I/O ports, built-in clockgenerating circuit 15-stage multifunction timer, on-chip oscillator, low-voltage reset, watchdog, keyboard interrupt, high-current I/O port Two 8-bit timers, UART, 22 programmable I/O ports, twochannel serial interface Oscillator, watchdog, 32-byte customer-code EPROM, UART, I2C, comparators, timers/counters, brown-out detector, power-on reset, keypad wakeup, LED drivers RC oscillator, 12-pin key matrix, one 8-bit timer, one 8-bit timer/counter, 14 interrupt sources, 32 I/O ports Analog comparator, programmable I/O, brown-out detector, 8-bit timer, watchdog 8-bit timer, watchdog, nine I/O lines with high-current capability, internal backup oscillator system, brown-out detection Nine interrupt sources, programmable watchdog timer, 22 programmable I/O ports
Mitsubishi
M37531M4
8-kbyte ROM 256-byte RAM
Motorola
68HC705KJ1
1240-byte OTP 64-byte RAM
2-kbyte RAM 128-byte RAM 2-kbyte OTP 128-byte RAM
Philips
P87LPC762
Samsung
KS86C0004
4-kbyte ROM 208-byte RAM
Scenix
SX28AC
3-kbyte flash 136-byte RAM 1 kbyte ROM or OTP 64-byte RAM 4-kbyte ROM 256-byte RAM
STMicro
ST6203CB1
Toshiba
TMP87C405AM
18 MICROCONTROLLERS
COMPANY
DEVICE
MEMORY
OTHER FEATURES
Xemics SA
XE8301
22-kbyte ROM 512-byte RAM
Clock prescalar, watchdog timer, power-on reset, supplylevel detection, 20-pin programmable I/O, crystal and RC oscillator, UART, four 8-bit timers with PWM
Zilog
Z8E000
0.5-kbyte OTP 32-byte RAM
One 16-bit timer, watchdog, four hardware interrupts, 13 I/O pins
2.3 Developing Applications with a Microcontroller
Now that we have a little bit of inside information about microcontrollers and what can be done using them, it is time to discover how to go about developing applications using these controllers. An ideal and a rather futuristic method is depicted in Figure 2.3. But let us for a moment consider what all is required to develop applications using controllers. Let us list one of the possible roadmaps for designing a microcontroller-based device.
1. First and foremost, define the requirements. 2. Create sufficient documentation to support the requirements in the form of block dia-
grams, flowcharts, timing diagrams, etc.
3. Search for suitable hardware to provide the necessary functionality. This may help the
designer realize whether a microcontroller is needed at all or not.
4. If you do need a microcontroller, then identify a suitable microcontroller that can act
as the brains for the device.
5. Once you have identified the controller, double-check that in fact the microcontroller
will satisfy the requirements in terms of speed, power consumption, etc. Otherwise you will have to iterate once again to choose another controller. 6. As a next step you will need to acquire all the tools to help develop the hardware and the software. These tools may include an assembler and/or a compiler if you wish to program in a high-level language, a simulator for the controller, if possible a hardware emulator, evaluation board, programmer for the controller, etc. 7. If you are already familiar with this particular controller, you can start designing and assembling a prototype; otherwise, you may need to get familiar with the controller by writing sample programs and testing them on the evaluation board or on the software simulator. 8. Once you become familiar with the features of the controller, you can start partitioning the software in manageable blocks that can be written as subroutines and tested
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